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38 results on '"Mécanique des Matériaux et des Structures (M2S)"'

1. Nonlinear dynamic simulation of cable based structures interacting with sliding objects using the concept of macro element

Author: Franck Bourrier, David Bertrand, Stéphane Grange, Thomas Langlade, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Erosion torrentielle neige et avalanches (UR ETGR (ETNA)), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), INSA Lyon, European Commission, and Region Auvergne-Rhone-Alpes
Subjects: Mechanical equilibrium, Computer science, Truss, 02 engineering and technology, law.invention, FEM and DEM, 0203 mechanical engineering, law, General Materials Science, Macro, business.industry, Applied Mathematics, Mechanical Engineering, Structural engineering, Macro finite element, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Discrete element method, Finite element method, Mechanical system, Dynamic simulation, 020303 mechanical engineering & transports, Mechanics of Materials, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Modeling and Simulation, Bending stiffness, Structural dynamics, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, 0210 nano-technology, business, Cable
Abstract: International audience; This paper presents the formulation of a finite element enclosing a specific internal mechanical equilibrium in order to model cable-based structures in dynamics conditions. It is based on the concept of macro finite element which allows embedding complex mechanical systems solved inside the element boundaries. A significant advantage is to allow an easy implementation within classical commercial codes. The proposed macro finite element describes a cable interacting with a sliding object assimilated to a punctual mass where friction can be accounted for. The dynamic response is described by a model developed within the framework of the DEM (Discrete Element Method) where geometrical nonlinearity (large displacements) is considered. A model combining the proposed macro finite element and a classical linear truss finite element is presented in order to validate its implementation. Finally, illustrative examples are presented. First, a cable yarning system is considered. The effect of friction and of the bending stiffness of the posts on the overall kinematics and force within the system are explored. Then the vulnerability of a cable-stayed bridge to earthquake is explored accounting for guy ropes failure.
Published: 2021
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2. Modelling of earthquake induced pounding between adjacent structures with a non-smooth contact dynamics method

Author: Langlade, Thomas, Bertrand, David, Grange, Stéphane, Candia, Gabriel, De La Llera, Juan Carlos, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Université de Lyon-Institut National des Sciences Appliquées (INSA), and Bertrand, David
Subjects: [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, [SPI.GCIV.DV] Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV.RISQ] Engineering Sciences [physics]/Civil Engineering/Risques, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2021

3. Tightening Torque Influence on Pullout Behavior of Post-installed Expansion Anchors

Author: Fabien Delhomme, Nicolas Rouane, Bertrand Pallud, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), and Hilti France
Subjects: pullout test, Load capacity, anchor, business.industry, 0211 other engineering and technologies, 020101 civil engineering, 02 engineering and technology, Structural engineering, Reinforced concrete, creep, 0201 civil engineering, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Tension response, 021105 building & construction, concrete, Torque, prestress, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, business, Slipping, Geology, Civil and Structural Engineering
Abstract: International audience; Post-installed anchors in reinforced concrete structures are increasingly important in current constructions especially in repair or upgrading works. A research program was completed to determine the influence of the tightening torque and the anchorage depth on the pullout performances of torque-controlled expansion anchors. The diameter d of the tested anchors was 10 mm. Six configurations were tested on 18 concrete blocks. Three pre-tension loads and two anchorage depths were considered. The results show that the fastening torque has no influence on the load-bearing capacity far away from the edges. However, an increase of the torque leads to a decrease of the anchor’s slipping during pullout tests. Nevertheless, applying an excessive fastening torque may lead to a steel-rupture of the anchor during the fastening phase. An increase of the anchorage depth leads to a better load capacity of the anchor and reduces the risk of concrete cone rupture. Finally, a simplified model of the tension response of the anchor with a bilinear load-displacement relationship has been suggested.
Published: 2018
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4. Effects of fungal decay on elasticity and damping of small-diameter silver fir logs assessed by the transverse vibration resonant method

Author: Freddy Rey, Jean Baptiste Barré, Franck Bourrier, David Bertrand, Loïc Brancheriau, Ecosystèmes montagnards (UR EMGR), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), BioWooEB (Cirad-Persyst-UPR 114 BioWooEB), Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), BioWooEB (UPR BioWooEB), and Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)
Subjects: K50 - Technologie des produits forestiers, Small diameter, 0211 other engineering and technologies, Larix, Young's modulus, 02 engineering and technology, Plant Science, Industrial and Manufacturing Engineering, 021105 building & construction, Quantitative assessment, General Materials Science, Mathematics, Élasticité, Altitude, Mathematical analysis, Forestry, 04 agricultural and veterinary sciences, Structural engineering, Propriété acoustique, Pseudotsuga menziesii, Transverse plane, symbols, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, Damping ratio, Vibration, Bois, Carie du bois, symbols.namesake, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, J12 - Manutention, transport, stockage et conservation des produits forestiers, Elasticity (economics), Propriété physicochimique, 040101 forestry, business.industry, Grume de sciage, Montagne, Pinus, Champignon pathogène, Abies alba, Transverse vibration, Propriété mécanique, 0401 agriculture, forestry, and fisheries, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, business
Abstract: A number of studies have shown the ability of the vibration resonant method (VRM) to measure the modulus of elasticity (MOE) and the damping ratio ( $$\xi$$ ) of calibrated wooden samples of various dimensions. This method based on free transverse vibrations was also studied to assess the decay extent in small stakes. Nevertheless, a need for investigations was identified in order to apply the method to decayed logs. Both decay and geometrical singularities brought heterogeneity not taken into account by the VRM. The aim of this study was to examine the effects of fungal decay on these two mechanical properties of small-diameter silver fir logs using the VRM. Fifty-five small-diameter logs were monitored over a decay process taking place in a greenhouse located near Grenoble (France). The MOE and $$\xi$$ were measured in intact and decayed states. The results showed the reliability of the measurements of both properties. $$\xi$$ was found to be independent of moisture content for wood above the fibre saturation point. The results validated the loss in MOE and the gain in $$\xi$$ due to fungal activity. Thus, indicators based on the MOE and $$\xi$$ were proposed and compared to quantify the decay extent. Indicators calculated from the first mode of vibration appeared to be relevant for that purpose. Future work is needed to validate indicators on structural size logs and to compare this quantitative assessment to those obtained by the standard EN 152 that currently serves as a benchmark.
Published: 2017
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5. Pullout Tests on Post-installed Bonded Anchors in Ultra-high Performance Fiber Reinforced Concrete

Author: Fabien Delhomme, Michael Brun, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), and Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon
Subjects: pullout test, Materials science, experiment, anchor, 0211 other engineering and technologies, 020101 civil engineering, 02 engineering and technology, Building and Construction, Fiber-reinforced concrete, bond, 0201 civil engineering, law.invention, [SPI]Engineering Sciences [physics], [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Compressive strength, fiber concrete, law, 021105 building & construction, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, Ultra high performance, Composite material, ComputingMilieux_MISCELLANEOUS, Civil and Structural Engineering
Abstract: International audience; An experimental study was completed on the behavior on post-installed bonded anchors in ultra-high performance fiber reinforced concrete with a compressive strength higher than 150 MPa. The aim was to analyze the failure mechanisms in static pullout tests. The diameter of the tested anchors was 12 mm and the studied parameters were the embedment depth, the edge distance and the state of cracking of the concrete block. In case of tests without edge effect in uncracked concrete, a combined pullout and concrete cone failure occurred for an embedment depth lower than 60 mm. The recorded mean bond stress was 32.5 MPa for uncracked concrete and 16.3 MPa for cracked concrete with a crack width of approximately 1 mm. A splitting failure was observed for shallow embedment and for edge distances lower than 60 mm. For this tested special anchor system, the increase in tensile strength provided by the metallic fibers enhances the tensile behavior of anchors in comparison to normal strength concrete. It is necessary to adapt the design codes developed for normal strength concrete in order to have more accurate and reliable prediction methods.
Published: 2019
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6. Influence des conditions de bétonnage sur le comportement à l’arrachement de chevilles d’ancrage courtes

Author: Delhomme, Fabien, Clément, Hervé, Roure, Thierry, Delhomme, Fabien, Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon)
Subjects: [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2019

7. Seismic analysis of RC structures using damage model and simplified modeling, 12th Canadian Conference on Earthquake Engineering

Author: Mazars, Jacky, Grange, Stéphane, Mazars, Jacky, Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)
Subjects: [SPI]Engineering Sciences [physics], [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SPI] Engineering Sciences [physics], [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.DV] Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2019

8. A novel identification method for obtaining bending moment–curvature relations of wood stems based on digital image correlation and SDOF analysis

Author: Nicolas Tardif, Franck Bourrier, David Bertrand, Jean-Baptiste Barré, Stéphane Grange, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
Subjects: Digital image correlation, Environmental Engineering, identification method, SDOF model, Scale (ratio), fresh wood, 0211 other engineering and technologies, Young's modulus, 02 engineering and technology, Bending, Curvature, symbols.namesake, bending behavior, 021105 building & construction, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], digital image correlation, 021101 geological & geomatics engineering, Civil and Structural Engineering, Mathematics, business.industry, Structural engineering, Finite element method, symbols, Bending moment, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, business, Beam (structure)
Abstract: International audience; Bending moment–curvature relations (M-χ) are useful in many beam modelling approaches. It allows describing in a simple way the mechanical behaviour at the cross-section scale and can be used to model continuous beams as single degree of freedom systems dedicated to perform stochastic analysis. This paper focused on tree mechanical charaterisation and presents an identification method for obtaining bending moment–curvature relationships up to failure from Digital Image Correlation (DIC) and experimental three points bending tests. Due to wood intrinsic variability, the proposed identification method has been validated from a Finite Element (FE) model which aims at simulating precisely the bending response of a cylindrical stem. The refined FE model has been developed based on the geometry and the boundary conditions of the experimentally tested stems. M-χ curves are derived from the FE model and used within a Single Degree Of Freedom (SDOF) approach. At the stem scale, the prediction of the SDOF model (Force-Displacement) is compared to the FE model and lead to a good agreement. Then the approach is used to characterise fresh European beech samples allowing deriving their mechanical properties (longitudinal Young modulus, modulus of elasticity and modulus of rupture).
Published: 2019
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9. Enhancement of a two-dimensional multifibre beam element in the case of reinforced concrete structures for taking into account the lateral confinement of concrete due to stirrups

Author: Stéphane Grange, Natalia Khoder, Yannick Sieffert, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), ANR-11-RSNR-0022,SINAPS@,Séisme et Installation Nucléaire -Améliorer et Pérenniser la Sûreté(2011), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), and SINAPS@ ANR-11-RSNR-0022,SINAPS@,SINAPS@: Séisme & Installations Nucléaires: Assurer et Pérenniser la Sûreté
Subjects: Environmental Engineering, Materials science, éléments finis, 020101 civil engineering, 02 engineering and technology, stirrups, 0201 civil engineering, 0203 mechanical engineering, Cyclic loading, Civil and Structural Engineering, business.industry, multifibre beam elements, béton armé, Structural engineering, Reinforced concrete, reinforced concrete, Finite element method, Transverse reinforcement, Transverse plane, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, 020303 mechanical engineering & transports, aciers transversaux, finite elements, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, business, élément poutre multifibre, Confinement
Abstract: International audience; To assess the seismic vulnerability of existing reinforced concrete structures, a large number of degrees of freedom is involved. Consequently, efficient numerical tools are required. In the case of slender elements, enhanced beam elements have been developed to try to introduce shear effects, but in these models, the transverse steel is sometimes taken into consideration with approximated manner or often not at all. However, as shown by some experimental tests, the amount of transverse reinforcement triggers significantly the behaviour of beam elements, especially under cyclic loading. Thus, the main goal of this work is to investigate solutions for an enhanced multifibre beam element accounting for vertical stretching of the cross section, occurring due to the presence of transverse reinforcement. The efficiency of the proposed modelling strategies is tested with results obtained from tension and flexure tests conducted on an elastic linear material. Moreover, the implementation of stirrups is verified by comparison with analytical analysis.; Pour déterminer la vulnérabilité sismique des structures existantes en béton armé, des méthodes de calcul numérique à l’échelle structurelle efficaces et suffisamment précises sont nécessaires. Dans le cas d’éléments poutres, les recherches actuelles concernent le développement de cinématiques enrichies pour mieux tenir compte de la déformation des sections. A cette échelle, des formulations permettent déjà de reproduire les déformations générées par le cisaillement. En revanche, concernant les cadres d’armatures, soit ils ne sont pas du tout considérés, soit ils ne permettent pas d’établir un véritable équilibre global de la section transversale permettant de calculer le confinement du béton. Cependant, comme le montrent certains essais expérimentaux, la quantité d’armatures transversales pilote d’une manière significative le comportement de ces poutres. Le travail présenté dans cet article propose un modèle poutre multifibre enrichi pour la prise en compte de l’effet de confinement du béton par les armatures transversales. Des déplacements transversaux additionnels permettent d’enrichir la cinématique de la section transversale pour calculer l’équilibre. Le modèle est dans un premier temps validé avec des tests simples et une loi de comportement élastique linéaire pour le matériau composant la section. De plus, l’implémentation des aciers transversaux est validée par une comparaison faite avec une analyse analytique.
Published: 2019
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10. Full-field measurement with a digital image correlation analysis of a shake table test on a timber-framed structure filled with stones and earth

Author: Stéphane Grange, Philippe Garnier, Yannick Sieffert, F. Vieux-Champagne, Laurent Daudeville, Jean-Charles Duccini, Laboratoire sols, solides, structures - risques [Grenoble] ( 3S-R ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut National Polytechnique de Grenoble ( INPG ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), CRAterre ( CRAterre ), École nationale supérieure d'architecture de Grenoble ( ENSAG ) -Ministère de la Culture et de la Communication ( MCC ), Mécanique des Matériaux et des Structures ( M2S ), Géomécanique, Matériaux et Structures ( GEOMAS ), Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ), Institut de recherche en astrophysique et planétologie ( IRAP ), Université Paul Sabatier - Toulouse 3 ( UPS ) -Observatoire Midi-Pyrénées ( OMP ) -Centre National de la Recherche Scientifique ( CNRS ), Institut Technologique Forêt Cellulose Bois-construction Ameublement ( FCBA ), Laboratoire Sols, Solides, Structures ( 3S ), Université Joseph Fourier - Grenoble 1 ( UJF ), Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), CRAterre (CRAterre), École nationale supérieure d'architecture de Grenoble (ENSAG)-Ministère de la Culture et de la Communication (MCC), Architecture, Environnement & Cultures Constructives (AE&CC), Ministère de la Culture et de la Communication (MCC)-École nationale supérieure d'architecture de Grenoble (ENSAG), École nationale supérieure d'architecture de Grenoble (ENSAG), and Institut Technologique Forêt Cellulose Bois-construction Ameublement (FCBA)
Subjects: 021110 strategic, defence & security studies, Engineering, Digital image correlation, business.industry, 0211 other engineering and technologies, Full scale, [ SPI.GCIV.DV ] Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, 020101 civil engineering, 02 engineering and technology, Structural engineering, Displacement (vector), Bracing, [SPI.MECA.GEME]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph], 0201 civil engineering, Infill, Shear wall, Earthquake shaking table, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, [ SPI.GCIV.STRUCT ] Engineering Sciences [physics]/Civil Engineering/Structures, Mortar, business, ComputingMilieux_MISCELLANEOUS, Civil and Structural Engineering
Abstract: International audience; This paper aims at presenting a digital correlation technique to capture the full-field displacement thanks to a high-speed camera of a full scale structure tested on a shaking table. The challenges are both the measurements at a full scale to visualize damages versus the resolution of pictures and the dynamical loading that requires a large number of pictures. The final goal is a better understanding of the seismic behavior of timber-framed structures with infill to help at modeling such structures and predicting their seismic vulnerability. For this purpose, results of shake table tests carried out on a full-scale one-story timber-framed house filled with stones bonded by an earth based mortar are presented and discussed. DIC full-field measurements allow deriving displacements and accelerations on shear walls as well as lateral forces applied on them. The experimental results presented herein allow analyzing the influence of bracing and might be used to propose optimized aseismic constructions based on cheap technological solutions. These results demonstrate the seismic-resistant behavior of timber-framed structures with infill and constitute a key issue for the promotion of such constructions in developing countries.
Published: 2016
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11. Pullout simulation of post installed chemically bonded anchors in UHPFRC

Author: Michael Brun, Fabien Delhomme, Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Delhomme, Fabien
Subjects: [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Materials science, lcsh:TA1-2040, 021105 building & construction, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, 0211 other engineering and technologies, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, 020101 civil engineering, 02 engineering and technology, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, lcsh:Engineering (General). Civil engineering (General), ComputingMilieux_MISCELLANEOUS, 0201 civil engineering
Abstract: An experimental and numerical study was completed in order to examine the mechanical behaviour of post-installed bonded anchors in ultra-high performance fibre reinforced concrete with a compressive strength higher than 130 MPa. The aim was to analyse the failure mechanisms in static pullout tests and to suggest a simple numerical model, which can be employed in a design stage, to reproduce the global behaviour of the anchor. The experimental observations show that a combined pullout and concrete cone failure occurred for an embedment depth of 40 mm and a steel rod failure for an embedment depth of 100 mm. The numerical model was set up using Abaqus software, by adopting the concrete damage plastic model and a surface-based cohesive behaviour for the interface concrete-anchor. The obtained failure modes and ultimate loads are in good agreement with experimental results. A minimum embedment depth of 50 mm was assessed to prevent a pullout failure of the anchor.
Published: 2018

12. Discrete Element Modelling of fragmentation with the open-source framework YADE

Author: Dodo, Manon, Guccione, Davide, Thoeni, Klaus, Giacomini, Anna, Bertrand, David, Bourrier, Franck, Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA), University of Newcastle [Australia] (UoN), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Ecosystèmes montagnards (UR EMGR), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), and Bertrand, David
Subjects: [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, [SPI.GCIV.DV] Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV.RISQ] Engineering Sciences [physics]/Civil Engineering/Risques, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2018

13. Développement de courbes de fragilité d’une structure de protection passive contre les avalanches de neige

Author: Ousset, I., Bertrand, David, Favier, Philomène, Eckert, Nicolas, Erosion torrentielle neige et avalanches (UR ETGR (ETNA)), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Université de Lyon-Institut National des Sciences Appliquées (INSA), Centro de Investigación para la Gestión Integrada del Riesgo de Desastres (CIGIDEN ), and Bertrand, David
Subjects: fragility curves, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV.DV] Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, dynamic conditions, snow avalanche, courbes de fragilité, avalanche, Structure de protection, Protective structure, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, conditions dynamiques, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV.RISQ] Engineering Sciences [physics]/Civil Engineering/Risques
Abstract: This paper presents an assessment of the failure probability of a reinforced concrete protective structure against snow avalanches within dynamic calculation conditions. A mass-spring numerical model, validated by finite elements models, is used in combination with a meta-model. Monte-Carlo simulations based on uncertainties propagation of material properties allow obtaining fragility curves for different loading rates. In theory, inertial effects are expected for only high rates and lead to a substantial modification of the fragility curve obtained in quasi-statics conditions. These rates are however a priori little met in the reality., Cette communication présente une évaluation de la probabilité de défaillance d’une structure de protection paravalanche en béton armé dans le cadre d’un calcul en conditions dynamiques. Un modèle numérique masse-ressort calé sur des modèles éléments finis est utilisé en association avec un méta-modèle. Des simulations Monte-Carlo basées sur la propagation des incertitudes liées aux caractéristiques des matériaux permettent d’obtenir diverses courbes de fragilité pour différents taux de chargement de la sollicitation avalancheuse. Les résultats montrent que des effets inertiels conduisant à une modification substantielle de la courbe de fragilité de la structure obtenue en conditions quasi-statiques sont à prévoir seulement pour des taux élevés a priori peu rencontrés dans la réalité.
Published: 2018

14. Introduction of shear warping in fibre beam elements for the computation of the nonlinear behaviour of concrete beams

Author: Sophie Capdevielle, Frédéric Dufour, Cédric Desprez, Stéphane Grange, Laboratoire de Mécanique et Technologie (LMT), École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Sécurité et Durabilité des Ouvrages d'Art (IFSTTAR/MAST/SDOA), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Communauté Université Paris-Est, Capdevielle, Sophie, Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: Materials science, Concrete beams, business.industry, Computation, Linear elasticity, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, Torsion (mechanics), 02 engineering and technology, Structural engineering, 01 natural sciences, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph], 010101 applied mathematics, Nonlinear system, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, 020303 mechanical engineering & transports, 0203 mechanical engineering, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], Transverse shear, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.MECA.STRU] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, 0101 mathematics, Image warping, business
Abstract: International audience; The present paper deals with modelling the nonlinear behaviour of concrete using the fibre element method. Proved to be efficient for slender structural elements mainly subject to normal stresses, the method lacks in accuracy when modelling the effect of shear. The present contribution proposes to enhanced a Timoshenko fibre beam element by adding shear warping deformations in the formulation. Transverse shear as well as torsion warping is taken into account, enabling the computation of the response to a complex loading. Warping degrees of freedom are computed simultaneously with the beam degrees of freedom by a fully implicit solution procedure. Concrete is modelled using a 3D damage model. Due to the coupling of warping and global beam degrees of freedom, the warping displacements in the beam element can evolve with the evolution of concrete damage. The beam element enhancement is validated at the cross-section scale considering a linear elastic behaviour. Enhanced beam elements are then used to model experimentally-tested structural elements. Both the linear and non-linear parts of the structural response are investigated.
Published: 2018

15. Enhancement of multifiber beam elements in the case of reinforced concrete structures for taking into account the lateral confinement of concrete due to stirrup

Author: Natalia Khoder, Stéphane Grange, Yannick Sieffert, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Sieffert, Yannick, Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), ECN/UN, and Grange, Stéphane
Subjects: Materials science, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, 0211 other engineering and technologies, 02 engineering and technology, Finite Elements, 010502 geochemistry & geophysics, 01 natural sciences, Multifiber Beam Elements, Stirrups, Cyclic loading, 0101 mathematics, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, business.industry, Structural engineering, Reinforced concrete, Stirrup, Transverse reinforcement, 010101 applied mathematics, Transverse plane, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Shear (geology), [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, business, Reinforced Concrete, Confinement
Abstract: Pour déterminer la vulnérabilité sismique des structures existantes en béton armé, des méthodes de calcul numérique à l’échelle structurelle efficaces et suffisamment précises sont nécessaires. Dans le cas d’éléments poutres, les recherches actuelles concernent le développement de cinématiques enrichies pour mieux tenir compte de la déformée des sections. A cette échelle, des formulations permettent déjà de reproduire les déformations de cisaillement. En revanche, concernant les cadres d’armatures, soit ils ne sont pas du tout considérés, soit ils ne permettent pas d’établir un véritable équilibre global de la section transversale permettant de calculer le confinement du béton. Cependant, comme le montrent certains essais expérimentaux, la quantité d’armatures transversales pilote d’une manière significative le comportement de ces poutres. Le travail présenté dans cet article propose un modèle poutre multifibre enrichi pour la prise en compte de l’effet de confinement du béton par les armatures transversales. Des déplacements transversaux additionnels d’enrichissement permettent d’enrichir la cinématique de la section transversale pour y calculer l’équilibre. Le modèle est dans un premier temps validé avec des tests simples et une loi de comportement élastique linéaire pour le matériau composant la section., Academic Journal of Civil Engineering, Vol 35 No 1 (2017): Special Issue - RUGC 2017 Nantes
Published: 2018

16. Behaviour of a 2D reinforced concrete frame structure under differential seismic excitation

Author: Ghannoum, Maria, Imtiaz, Afifa, Grange, Stéphane, Causse, Matthieu, Cornou, Cécile, Baroth, Julien, Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Mécanique des Matériaux et des Structures (M2S), Sols - Matériaux - Structures, Intégrité et Durabilité (SMS-ID), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Institut des Sciences de la Terre (ISTerre), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF), ANR-11-EQPX-0040/11-EQPX-0040,RESIF-CORE,Réseau sismologique et géodésique français : l’équipement fondamental(2011), European Project: 262330,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2010-1,NERA(2010), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and ANR-11-EQPX-0040,RESIF-CORE,Réseau sismologique et géodésique français : l'équipement fondamental(2011)
Subjects: Differential Seismic Excitation, Finite Element Model, Nonlinear Behavior, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, Reinforced Concrete Frame Structure, Physics::Geophysics
Abstract: International audience; Two very dense seismographic arrays were deployed in a seismically active area in Greece to incorporate the difference in amplitude and phase between two stations located within the dimension of a structure. The spatial variability in seismic ground motion is generally attributed to the wave passage effect, the incoherence effect, and the local site effect. It can cause severe damage on lifeline structures. This article studies the behavior of a reinforced concrete 2D frame structure subjected to differential seismic excitation at the supports. Both linear and nonlinear finite multifiber element models of the seismic behavior of this structure are used. The nonlinear behavior of the structure, under these different cases, displays different damage patterns and maximum displacements. This study allows evaluating the uncertainty that can be propagated through the finite element model, aiming at reducing variability for structural design purposes.
Published: 2018
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17. Integration of material and process modelling in a business decision support system: Case of COMPOSELECTOR H2020 project

Author: Borek Patzak, Ali Daouadji, Sabrina Pricl, Salim Belouettar, Carlos Kavka, Gaetano Giunta, Gast. Rauchs, Hein Koelman, Angela Madeo, Belouettar, Salim, Kavka, Carlo, Patzak, Borek, Koelman, Hein, Rauchs, Gast., Giunta, Gaetano, Madeo, Angela, Pricl, Sabrina, Daouadji, Ali, Luxembourg Institute of Science and Technology (LIST), Esteco SpA, Czech Technical University in Prague (CTU), Dow Benelux N.V., Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), University of Trieste, Groupe de Recherche en Géomécanique (GRG), and The authors would like to acknowledge the support of EU H2020 COMPOSELECTOR project (GA no: 721105).
Subjects: Process modeling, Business process, Computer science, Interoperability, BPMN, 02 engineering and technology, Model selection, KPIs, Business Process Model and Notation, 0203 mechanical engineering, Material selection, Business decision mapping, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, DMN, BDSS, MODA, Civil and Structural Engineering, Life Cycle Engineering, Data, Metadata, [SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable, Business decision, [SPI.GCIV.GEOTECH]Engineering Sciences [physics]/Civil Engineering/Géotechnique, 021001 nanoscience & nanotechnology, Material model, Engineering management, 020303 mechanical engineering & transports, Ceramics and Composites, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, Performance indicator, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV.MAT]Engineering Sciences [physics]/Civil Engineering/Matériaux composites et construction, 0210 nano-technology, KPI
Abstract: International audience; This paper shares and contributes to a ground-breaking vision developed and being implemented which consists in the integration of materials modelling methodologies and knowledge-based systems with business process for decision making. The proposed concept moves towards a new paradigm of material and process selection and design by developing and implementing an integrated multi-disciplinary, multi-model and multi-field approach together with its software tool implementation for an accurate, reliable, efficient and cost effective prediction, design, fabrication, Life Cycle Engineering (LCE), cost analysis and decision making. This new paradigm of integrated material design is indeed endowed with a great potential by providing further insights that will promote further innovations on a broad scale.
Published: 2018
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18. Experimental Analysis of a Shake Table Test of Timber-Framed Structures with Stone and Earth Infill

Author: Yannick Sieffert, Stéphane Grange, C. Belinga Nko'ol, E. Bertrand, Laurent Daudeville, Jean-Charles Duccini, F. Vieux-Champagne, Carole Faye, CRAterre ( CRAterre ), École nationale supérieure d'architecture de Grenoble ( ENSAG ) -Ministère de la Culture et de la Communication ( MCC ), Laboratoire sols, solides, structures - risques [Grenoble] ( 3S-R ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut National Polytechnique de Grenoble ( INPG ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Mécanique des Matériaux et des Structures ( M2S ), Géomécanique, Matériaux et Structures ( GEOMAS ), Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ), Equipes Traitement de l'Information et Systèmes ( ETIS ), Ecole Nationale Supérieure de l'Electronique et de ses Applications ( ENSEA ) -Université de Cergy Pontoise ( UCP ), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Sols, Solides, Structures ( 3S ), Université Joseph Fourier - Grenoble 1 ( UJF ), Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), CRAterre (CRAterre), École nationale supérieure d'architecture de Grenoble (ENSAG)-Ministère de la Culture et de la Communication (MCC), Architecture, Environnement & Cultures Constructives (AE&CC), Ministère de la Culture et de la Communication (MCC)-École nationale supérieure d'architecture de Grenoble (ENSAG), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement - Direction Méditerranée (Cerema Direction Méditerranée), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement (Cerema), and Institut Technologique Forêt Cellulose Bois-construction Ameublement (FCBA)
Subjects: 021110 strategic, defence & security studies, Engineering, [SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable, business.industry, 0211 other engineering and technologies, 020101 civil engineering, [ SPI.GCIV.DV ] Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, 02 engineering and technology, Structural engineering, Geotechnical Engineering and Engineering Geology, 0201 civil engineering, Geophysics, Infill, [ SPI.GCIV ] Engineering Sciences [physics]/Civil Engineering, Earthquake shaking table, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, Geotechnical engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, [ SPI.GCIV.STRUCT ] Engineering Sciences [physics]/Civil Engineering/Structures, Mortar, business, Earth (classical element), ComputingMilieux_MISCELLANEOUS
Abstract: International audience; The seismic performance of timber-framed structures filled with stones and earth mortar has been analyzed by introducing the structural subscales (cell, wall, house) at which monotonic and cyclic loadings were considered. This article aims to present the dynamic behavior of a house as determined through shaking table tests. Based on this experimental multiscale analysis, this paper confirms that timbered masonry structures offer effective seismic resistance; moreover, such a comprehensive analysis helps enhance understanding of the seismic-resistant behavior of timber-framed structures with infill. This paper also aids ongoing development of a numerical tool intended to predict the seismic-resistant behavior of this type of structure.
Published: 2017
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19. A warping multifibre beam model to assess the seismic vulnerability ofexisting reinforced concrete structures

Author: CAPDEVIELLE, Sophie, Grange, Stéphane, Dufour, Frédéric, DESPREZ, Cédric, Laboratoire de Mécanique et Technologie (LMT), École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Sécurité et Durabilité des Ouvrages d'Art (IFSTTAR/MAST/SDOA), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Communauté Université Paris-Est, Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: International audience
Published: 2017

20. EXTENDED EXPERIMENTAL STUDIES ON ROCKFALL FLEXIBLE FENCES

Author: Olmedo, Ignacio, ROBIT, Philippe, Bertrand, David, Galandrin, Clément, Coulibaly, Jibril, Chanut, Marie-Aurélie, Géotechnique et travaux spéciaux, GTS, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Université de Lyon-Institut National des Sciences Appliquées (INSA), Entreprise CAN, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement - Direction Centre-Est (Cerema Direction Centre-Est), and Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement (Cerema)
Subjects: [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2017

21. A multifiber beam model for the thermo-mechanical analysis of RC structures: simulation of the ConCrack benchmark RG8 test

Author: Mazars, Jacky, Grange, Stéphane, Briffaut, Matthieu, Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), and Mazars, Jacky
Subjects: [SPI]Engineering Sciences [physics], [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SPI] Engineering Sciences [physics], [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2017

22. Influence du couple de serrage sur le comportement à l’arrachement d’ancrages post-installés à expansion

Author: Rouane, Nicolas, Salomon, Pierre, Pallud, Bertrand, Delhomme, Fabien, Delhomme, Fabien, Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA), Géomécanique, Matériaux et Structures (GEOMAS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon)
Subjects: [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2017

23. Prestress load influence on pullout behavior of post-installed torque-controlled expansion anchors

Author: Rouane, Nicolas, Salomon, Pierre, Pallud, Bertrand, Delhomme, Fabien, Delhomme, Fabien, Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA), Géomécanique, Matériaux et Structures (GEOMAS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon)
Subjects: [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2017

24. Decay extent assessment of small-diameter silver fir logs degraded in natural conditions in the French Northern Alps using NIRS and vibration resonance methods

Author: David Bertrand, Franck Bourrier, Marie-France Thévenon, Jean-Baptiste Barré, Freddy Rey, Ecosystèmes montagnards (UR EMGR), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Erosion torrentielle neige et avalanches (UR ETGR (ETNA)), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), Sols - Matériaux - Structures, Intégrité et Durabilité (SMS-ID), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), BioWooEB (UPR BioWooEB), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST), BioWooEB (Cirad-Persyst-UPR 114 BioWooEB), and Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)
Subjects: K50 - Technologie des produits forestiers, Engineering, Small diameter, 010501 environmental sciences, 01 natural sciences, Degradation process, biology, [SDE.IE]Environmental Sciences/Environmental Engineering, Élasticité, 04 agricultural and veterinary sciences, Vegetation, Structural engineering, Abies alba, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, Near infra red spectroscopy, Environmental Engineering, Spectroscopie infrarouge, Soil science, Bioengineering, Management, Monitoring, Policy and Law, Vibration, Natural (archaeology), Bois, Microbial community, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, J12 - Manutention, transport, stockage et conservation des produits forestiers, 0105 earth and related environmental sciences, Nature and Landscape Conservation, Vibration resonance method, business.industry, Resonance, Near infra-red spectroscopy, Grume de sciage, Modulus of elasticity, 15. Life on land, Champignon pathogène, biology.organism_classification, Biodétérioration, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, U30 - Méthodes de recherche, business
Abstract: International audience; Bioengineering structures devoted to natural hazard mitigation often require the implementation of vegetation and inert materials, mainly timber logs. The latter are intended to ensure the protective function of the structure until the crop development of the plants is sufficient. The structural use of raw wood, i.e. without wood preservative treatment, in severe decay conditions is specific to the bioengineering structures. It raises practical and scientific issues regarding wood-decay assessment for structure management as well as for studies related to design improvements. In this study, two methods assessing the level of decay – the near infra-red spectroscopy (NIRS) method and the vibration resonance method (VRM) – developed on logs degraded in semi-controlled conditions were applied and compared. These methods are based on a mechanical definition of the level of decay by means of the normalized loss in the modulus of elasticity between intact and decayed states. The level of decay of 60 small-diameter silver fir logs degraded in natural conditions in the French Northern Alps was assessed using both methods. The samples had been put on the ground in four different sites near alpine torrents. The degradation process was assumed to take place in aerobic conditions. Prior to assessment of the level of decay, the applicability of the methods was verified. The level of decay was based on a classification varying from class 1 for the least decayed logs to class 4. Both methods allowed assessing the effects of the microbial activity on the logs. The levels of decay found were mainly classes 1 and 2 in both cases but to various extents depending on the method. Finally, the NIRS method was found to be less reliable than VRM. VRM can be used to assess the level of decay of logs decayed in natural conditions.
Published: 2017
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25. Pullout behavior of post installed bonded anchors in UHPFRC

Author: Delhomme, Fabien, Chaudet, Philippe, Gioratto, Jean, Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon, Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon, Mécanique des Matériaux et des Structures (M2S), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), and Delhomme, Fabien
Subjects: [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2016

26. How the scientific collaboration of engineers and architects on local building cultures can make a vital breakthrough: 10 years of works in Grenoble to support people affected by disasters and make communities resilient

Author: Yannick Sieffert, Vieux-Champagne, F., Dominique Daudon, Philippe Garnier, Jean-Marc Huygen, Olivier Moles, Christian Belinga Nko’o, Stéphane Grange, Daudeville, L., Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), GéoMécanique, CRAterre (CRAterre), École nationale supérieure d'architecture de Grenoble (ENSAG)-Ministère de la Culture et de la Communication (MCC), Architecture, Environnement & Cultures Constructives (AE&CC), École nationale supérieure d'architecture de Grenoble (ENSAG), École nationale supérieure d'architecture de Marseille-Luminy (ENSA-M), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon, Ministère de la Culture et de la Communication (MCC)-École nationale supérieure d'architecture de Grenoble (ENSAG), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Architecture, Environnement & Cultures constructives (AE&CC), and Sieffert, Yannick
Subjects: [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SHS.ARCHI]Humanities and Social Sciences/Architecture, space management, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SHS] Humanities and Social Sciences, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, [SHS.ARCHI] Humanities and Social Sciences/Architecture, space management, [SHS]Humanities and Social Sciences
Abstract: International audience; In the majority of universities around the world, architectural and civil engineering disciplines are often siloed. This division is detrimental to the relationship between the construction industry and the design industry but also to the research field. To address this issue, two institutions in Grenoble (ENSAG/CRAterre and UJF/3SR) started to offer multidisciplinary initiative courses in 2007 ("Conception collaborative" course and "Projet multidisciplinaire" involving master students). Thanks to this first innovative pedagogic collaboration the gap between researchers has been bridged and followed by research projects in order to enhance the seismic resistant knowledge of traditional construction with earth.
Published: 2016

27. Numerical efficiency of non-differentiable constitutive law : Application to Mazars Unilateral damage model

Author: Chandra, Johanes, Dufour, Frédéric, Grange, Stéphane, Institut des Sciences de la Terre (ISTerre), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Mécanique et Couplages Multiphysiques des Milieux Hétérogènes (CoMHet ), Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF), Mécanique et Couplages Multiphysiques des Milieux Hétérogènes (CoMHet), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), and Dufour, Frédéric
Subjects: [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.MAT] Engineering Sciences [physics]/Materials, [SPI.GCIV.RISQ] Engineering Sciences [physics]/Civil Engineering/Risques, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: International audience; In non linear concrete structure modeling, an efficient numerical resolution scheme is as important as thechoice of the constitutive law. When using Newton-Raphson approach, providing tangent stiffness matrix iscrucial to improve the numerical efficiency related to the iterative process. However, non-differentiablerelations are often encountered (e.g. the Macauley bracket or absolute operator) does not allow the analyticalderivation of the tangent matrix.In this study, three strategies are proposed and compared to deal with this issue. These strategies are appliedto the Mazars Unilateral damage model (Mazars et al., 2015) that has non-differentiable operators in themodel. The first solution is to assume a radial loading path, the second is to analytically regularize the non-differentiable functions and finally is the use of numerical differentiation. The numerical implementation isperformed in Code_Aster finite element software. The performance of the proposed approaches are thencompared in terms of convergence rate, robustness, and computational time at both the elementary level andstructural level. In elementary level, all methods present quadratic convergence for radial loading, but onlythe numerical estimation keep this convergence rate for any loading trajectories. In structural level of areinforced concrete beam in bending with local model, the occurrence of micro snap-backs due to crackingof an element introduces convergence difficulties and hence further strategies are needed.
Published: 2016

28. Experimental analysis of the response of fresh wood stems subjected to localized impact loading

Author: F. Bourrier, Ali Limam, David Bertrand, David Toe, Frédéric Berger, Ignacio Olmedo, Ecosystèmes montagnards (UR EMGR), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Mécanique des Matériaux et des Structures (M2S), Sols - Matériaux - Structures, Intégrité et Durabilité (SMS-ID), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire de Génie Civil et d'Ingénierie Environnementale (LGCIE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)
Subjects: Plant Science, Permanent Deformation, Industrial and Manufacturing Engineering, Displacement (vector), Longitudinal Modulus, Rockfall, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, General Materials Science, Geotechnical engineering, Fresh Wood, Stem Diamete, Physics, geography, Impact Force, geography.geographical_feature_category, business.industry, Pendulum, Forestry, Structural engineering, 15. Life on land, Dissipation, Partial rupture, Impact loading, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, Impact, business
Abstract: International audience; The forest is a well known and efficient natural protection solution against rockfall. To compensate for a loss of the forest’s protective function after windstorms or maintenance tasks, some of the felled trees can be left in an oblique position on the slope as wooden protection structures. No studies have been conducted on the efficacy of these devices and particularly their resistance to rock impacts and their energy dissipation capacity. The dynamic response of fresh stems to impact was analyzed by laboratory impact experiments with a Mouton-Charpy pendulum. The experimental results allowed the definition of different impact types related to the occurrence of nonlinear processes associated with partial rupture of wood fibers. The physics controlling the stem loading force and displacement were shown to be mainly associated with inertial effects during the early stages of the impact. Second, when the stem displacements become larger, the stem response becomes quasi-static. Based on these results, a practical approach for assessing the capacity of wooden structures made of fallen trees to resist rock impact was proposed and evaluated.
Published: 2015
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29. Quantification of the spatially variable ground motion and its influence on the linear and non-linear structural response of a single degree of freedom. Application to the shallow sedimentary valley of Argostoli, Greece

Author: Koufoudi, Eleni, Cornou, Cécile, Grange, Stéphane, Dufour, Frédéric, Imtiaz, Afifa, Institut des Sciences de la Terre (ISTerre), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique et Couplages Multiphysiques des Milieux Hétérogènes (CoMHet), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), and Dufour, Frédéric
Subjects: [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.MAT] Engineering Sciences [physics]/Materials, [SPI.GCIV.RISQ] Engineering Sciences [physics]/Civil Engineering/Risques, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract: International audience; The term “spatial variability of seismic ground motions” denotes the differences in the amplitude and phase content of seismic motions recorded over extended areas but even within the dimensions of a structure. At few tens of meters scale, such spatial variability may indeed have important effect on the response of extended lifelines because of the spatially variable contributions applied at different supports of the structure. The goal of the present study is to quantify the spatially variable ground motion and consequences on the structural response in the shallow sedimentary basin of Argostoli, Greece. Indeed, the present study makes use of around 400 seismic events recorded by a 21-element very dense seismological array with interstation spacing ranging from 5 to 160 meters. Composed of broad-band three-component velocimeters, this array was deployed in the basin of Argostoli during 6 months and recorded local, regional and teleseismic events. The spatial correlation structure and input motion variability is first evaluated in terms of peak ground displacement and by considering broad-band time series and filtered ones within various frequency bands from 0.5 to 20 Hz. Next, the structural response of a single degree of freedom (SDOF) system with various fundamental periods is estimated in terms of maximum top displacement of the system. The variability of the linear elastic structural response is found to increase from 8% to 15% from 0.5 to 20 Hz (which is consistent with a decrease of the correlation between peak ground motion values with increased frequencies), with however larger variabilities observed within two narrow frequency ranges, between 1.5 and 1.7 Hz and between 3 and 4 Hz. Such high variabilities are caused by locally edge-generated diffracted surface waves, namely the fundamental mode of Love waves and the first higher mode of Rayleigh waves, that strongly dominate the ground motion wavefield within those specific frequency bands. Then, the non-linear elastoplatic structural response of the SDOF system is investigated and shows that the variability of the structural response is almost constantly increased by 5% compared to the linear structural response.
Published: 2015

30. Smeared damage model and crack localization for RC multi-fiber beam descriptions

Author: Mazars, Jacky, Grange, Stéphane, Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), and Mazars, Jacky
Subjects: [SPI]Engineering Sciences [physics], [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SPI] Engineering Sciences [physics], [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS
Abstract: International audience
Published: 2015

31. Experimental and numerical dynamic analysis of a live tree stem impacted by a Charpy pendulum

Author: M. Brun, Ali Limam, Frédéric Berger, David Bertrand, I. Olmedo, Franck Bourrier, Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA), Géomécanique, Matériaux et Structures (GEOMAS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Ecosystèmes montagnards (UR EMGR), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Laboratoire de Génie Civil et d'Ingénierie Environnementale (LGCIE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)
Subjects: Engineering, 0211 other engineering and technologies, Charpy impact test, 02 engineering and technology, Rockfall, 0203 mechanical engineering, medicine, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, General Materials Science, ROCKFALL, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, CALIBRATION, geography, FEM NON LINEAR COMPUTATIONS, geography.geographical_feature_category, business.industry, Applied Mathematics, Mechanical Engineering, Pendulum, Stiffness, Structural engineering, 15. Life on land, Condensed Matter Physics, Finite element method, EXPERIMENTAL IMPACT TEST, NATURAL HAZARDS, LIVE TREE STEM, 020303 mechanical engineering & transports, Mechanics of Materials, Dynamic loading, Modeling and Simulation, Displacement field, Trajectory, IMPACT DYNAMICS, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, medicine.symptom, business
Abstract: International audience; In recent years, the forest has been used as a protective structure to reduce rockfall propagation. When a rock propagates down a forested slope, it hits trees and these interactions modify its trajectory. This paper focuses on the dynamic behavior of small-diameter live trees impacted by a rock To better understand the protective effect of forests against rockfalls, a finite element (FE) model of a live stem subjected to a local dynamic loading is proposed. Large displacements and material nonlinearities are taken into account. The numerical simulations are calibrated based on laboratory tests (free oscillation tests and impact tests). The displacement field measured by a high-speed camera is correctly reproduced by the FE model for both kinds of tests. For impact tests, the analysis of the impactor-stem interaction identified three main regimes of the stem's response (quasi-static/intermediate/impulsive). These depend on the impactor's and stem's mechanical and geometrical features (relative mass and stiffness). Finally, we attempt to predict the regime response of the stem as a function of its diameter and the impactor mass.
Published: 2013
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32. Full-Scale Dynamic Analysis of an Innovative Rockfall Fence Under Impact Using the Discrete Element Method: from the Local Scale to the Structure Scale

Author: David Bertrand, Ayman Trad, C. Silvani, A. Limam, Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA), Géomécanique, Matériaux et Structures (GEOMAS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Laboratoire de Génie Civil et d'Ingénierie Environnementale (LGCIE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), and Groupe de Recherche en Géomécanique (GRG)
Subjects: Fence (finance), Structure (mathematical logic), 021110 strategic, defence & security studies, geography, Engineering, geography.geographical_feature_category, Scale (ratio), Underline, business.industry, 0211 other engineering and technologies, Full scale, Geology, 02 engineering and technology, Structural engineering, Geotechnical Engineering and Engineering Geology, Discrete element method, Rockfall, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, Calibration, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, business, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, Civil and Structural Engineering
Abstract: In order to protect infrastructures against rockfalls, civil-engineered mitigation measures are widely used. Flexible metallic fences are particularly well suited to stop the propagation of blocks of rock whose kinetic energy can reach 5000 kJ before impact. This paper focuses on the design of highly flexible rockfall fences under the new European guideline ETAG027. The experimental testing and the numerical modeling using the discrete element method (DEM) of a new metallic rockfall fence are presented. Several scales of study were considered; the mesh, the net and the entire structure. The calibration of the DEM models is described and a parametrical study is proposed. The latter aims to underline the type of information that can be obtained from numerical simulations of such a system to enhance its design.
Published: 2012
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33. Modélisation numérique de cellules géocomposites pour la protection contre les éboulements rocheux

Author: David Bertrand, Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Érosion torrentielle, neige et avalanches (UR ETGR (ETNA)), and Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF)
Subjects: Engineering, Environmental Engineering, Scale (ratio), 0211 other engineering and technologies, 02 engineering and technology, Granular material, Dynamic load testing, Rockfall, 0203 mechanical engineering, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, Simulation, ComputingMilieux_MISCELLANEOUS, General Environmental Science, 021101 geological & geomatics engineering, Civil and Structural Engineering, geography, geography.geographical_feature_category, Computer simulation, business.industry, Geocomposite, Experimental data, Structural engineering, Discrete element method, 020303 mechanical engineering & transports, [SDE]Environmental Sciences, General Earth and Planetary Sciences, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, business
Abstract: International audience; This study investigated rockfall protection barriers built with cell assembly. This structure was modelled using a multiscale approach where the cell scale and the barrier scale were distinguished. This paper focuses on the cell modelling. Cells are composed of a granular media surrounded by a wire mesh. The medium is described using the discrete element method, which is well suited to simulating its granular nature. The numerical model was calibrated and validated by comparing the simulation results to experimental data from mechanical tests on 500-mm cube-like cells. These tests were conducted in quasi-static condition and dynamic condition. The numerical results were in agreement with the experimental results.; L'étude porte sur des structures de protection contre les chutes de bloc à technologie cellulaire. Ce type d'ouvrage fait l'objet d'une modélisation multiéchelle où on distingue l'échelle de la cellule de celle de l'ouvrage. Cet article présente la modélisation numérique de cellules remplies de pierres entourées par un grillage métallique à maille hexagonale. La description du matériau granulaire est réalisée à partir d'une approche numérique discrète adaptée pour simuler sa granularité. Le calage et la validation du modèle numérique sont effectués en comparant les résultats des simulations numériques à des essais expérimentaux réalisés sur des cellules cubiques de 500mm de côté dans des conditions quasi-statique et dynamique d'impact. Les résultats numériques sont en accord avec les expérimentations.
Published: 2011
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34. Pseudo-dynamic tests on low-rise shear walls and simplified model based on the structural frequency drift

Author: Alexis Courtois, M. Brun, David Bertrand, P. Labbe, EDF Division Production Nucléaire/Division Ingénierie Nucléaire (EDF DPN/DIN), EDF (EDF), Laboratoire de Génie Civil et d'Ingénierie Environnementale (LGCIE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA), Géomécanique, Matériaux et Structures (GEOMAS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Division Production Ingéniérie Hydraulique (EDF DPIH)
Subjects: Engineering, Normal force, business.industry, Frequency drift, 0211 other engineering and technologies, System identification, Stiffness, 020101 civil engineering, 02 engineering and technology, Structural engineering, Finite element method, 0201 civil engineering, Consistency (statistics), 021105 building & construction, medicine, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, Shear wall, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, medicine.symptom, business, ComputingMilieux_MISCELLANEOUS, Civil and Structural Engineering, Dynamic testing
Abstract: Twelve low-rise shear walls, with the same aspect ratio of 0.4 but with different structural parameters including the design frequency, reinforcement ratio and normal force, have been submitted to pseudo-dynamic (PSD) tests conducted at the ELSA laboratory of the Joint Research Centre. The focus of this testing campaign was to study the engineering margin for shear walls depending on the relative position of their structural frequency with respect to the excitation peak. After presenting the parameters of the PSD tests, three methods for identifying the structural frequency drift observed as damage occurs have been used in this paper: a numerical identification from a nonlinear pushover analysis, and two methods from experimental data, a system identification method based on an error output model and a more direct identification method based on the secant stiffness of force–displacement cycles. For each shear wall, a relationship f ( X ) between the structural frequency and the maximum of the top-displacement is derived from the previous methods and the consistency between the three approaches has been checked. Finally, these f ( X ) curves have been employed in a single degree of freedom model for predicting time–history top-displacements. The predictions turn out to be quite satisfactory, in particular when f ( X ) relationship is identified by the error output model.
Published: 2011
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35. Multiscale approach to geo-composite cellular structures subjected to rock impacts

Author: Stéphane Lambert, David Bertrand, Philippe Gotteland, François Nicot, Érosion torrentielle, neige et avalanches (UR ETGR (ETNA)), Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Mécanique des Matériaux et des Structures (M2S), Sols - Matériaux - Structures, Intégrité et Durabilité (SMS-ID), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Erosion torrentielle neige et avalanches (UR ETGR (ETNA)), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), and Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: Engineering, elasto-plastic behaviour, granular materials, Composite number, ELASTO PLASTIC, 0211 other engineering and technologies, Computational Mechanics, Structure (category theory), 02 engineering and technology, multi-scale approach, Granular material, 0203 mechanical engineering, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, General Materials Science, discrete element method, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, protective-reinforced structure, business.industry, mechanical interaction, wire structure, Structural engineering, Geotechnical Engineering and Engineering Geology, Discrete element method, Cellular material, 020303 mechanical engineering & transports, Mechanics of Materials, [SDE]Environmental Sciences, Regular array, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, business, Discrete modelling
Abstract: International audience; Geo-composite cellular structures are an efficient technological solution for various applications in civil engineering. This type of structure is particularly well adapted to resisting rockfalls and can act as a defensive structure. However, the design of such structures is for the most part empirically based; this lack of research-based design stagnates optimization and advanced development. In this paper, the mechanical behaviour of a geo-composite cellular structure is investigated using a multi-scale approach, from the individual cell made up of an assembly of rocky particles contained in a wire netting cage to the entire structure composed of a regular array of cells. Based on discrete modelling of both the cell and structure scales, a computational tool has been developed for design purposes.
Published: 2007
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36. Modelling a geo-composite cell using discrete analysis

Author: Stéphane Lambert, François Nicot, David Bertrand, Philippe Gotteland, Érosion torrentielle, neige et avalanches (UR ETGR (ETNA)), Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF), LIRIGM UJF GRENOBLE I, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Erosion torrentielle neige et avalanches (UR ETGR (ETNA)), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), and Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique de Grenoble (INPG)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )
Subjects: Engineering, elasto-plastic behaviour, Scale (ratio), granular materials, Discrete analysis, Constitutive equation, Composite number, 0211 other engineering and technologies, 02 engineering and technology, 0203 mechanical engineering, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, discrete element method, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, business.industry, mechanical interaction, Unconfined compression, wire structure, Structural engineering, Geotechnical Engineering and Engineering Geology, Discrete element method, Computer Science Applications, 020303 mechanical engineering & transports, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, business, Confined compression
Abstract: International audience; Reinforced soil structures can be used to protect infrastructures against rockfalls. An innovative way to implement such protection is to construct the front face using a cellular assembly. This paper focuses on the cellular scale, with the cell a complex heterogeneous material, composed of a wire netting box filled with rocky particles. The behaviour of a single cell was modelled using the discrete element method, thus accounting for the interaction between the rocky particles and the interaction between the box and the rocky particles. A constitutive model was developed and calibrated along confined compression loading paths, then preliminary elements of validation were obtained from the simulation of unconfined compression tests.
Published: 2005
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37. Varying Dam Height to Shorten the Run-Out of Dense Avalanche Flows: Developing a Scaling Law from Laboratory Experiments

Author: P. Lachamp, Mohamed Naaim, David Bertrand, Florence Naaim-Bouvet, Thierry Faug, Érosion torrentielle, neige et avalanches (UR ETGR (ETNA)), Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Erosion torrentielle neige et avalanches (UR ETGR (ETNA)), and Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
Subjects: Scaling law, 010504 meteorology & atmospheric sciences, 0211 other engineering and technologies, 02 engineering and technology, Dissipation, Granular material, Snow, 01 natural sciences, Run-out, Colada, Physics::Geophysics, Geophysics, 13. Climate action, Geochemistry and Petrology, Coulee, [SPI.GCIV.RISQ]Engineering Sciences [physics]/Civil Engineering/Risques, Environmental science, Geotechnical engineering, [SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences
Abstract: International audience; Dry and dense snow avalanches are considered as dry granular flows. Their interaction with dams is the main objective of this paper. We studied how varying the dam height could shorten a granular avalanche run-out thanks to a set of simple laboratory experiments carried out on different scales. Shortening the run-out was expected to depend on two effects: (i) storage of the granular material upstream of the dam and (ii) local energy dissipations. A scaling law is highlighted. As suggested by dimensional arguments, the contribution of the local energy dissipations was shown to be more dominant than the storage effects.
Published: 2003
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38. Traditional Timber-Framed Infill Structure Experimentation with Four Scales Analysis (To Connection from a House Scale)

Author: Yannick Sieffert, Florent Vieux-Champagne, Stéphane Grange, Philippe Garnier, Jean-Charles Duccini, Laurent Daudeville, Sieffert, Yannick, Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Mécanique des Matériaux et des Structures (M2S), Géomécanique, Matériaux et Structures (GEOMAS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Architecture, Environnement & Cultures constructives (AE&CC), École nationale supérieure d'architecture de Grenoble (ENSAG)-Ministère de la Culture et de la Communication (MCC), CRAterre (CRAterre), École nationale supérieure d'architecture de Grenoble (ENSAG), Institut Technologique Forêt Cellulose Bois-construction Ameublement (FCBA), Laboratoire sols, solides, structures - risques [Grenoble] (3SR ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Risques, Vulnérabilité des structures et comportement mécanique des matériaux (RV ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Architecture, Environnement & Cultures Constructives (AE&CC), and Ministère de la Culture et de la Communication (MCC)-École nationale supérieure d'architecture de Grenoble (ENSAG)
Subjects: [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT] Engineering Sciences [physics]/Civil Engineering/Structures, [SPI.GCIV] Engineering Sciences [physics]/Civil Engineering, [SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures, ComputingMilieux_MISCELLANEOUS
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