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Start Over Topic [phys.nexp]physics [physics]/nuclear experiment [nucl-ex]
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1. Effect of steel reinforcement corrosion on the dynamic behavior of RC beams

Author

LEJOUAD, CHAYMAA, Richard, Benjamin, MONGABURE, Philippe, CAPDEVIEILLE, Sophie, RAGUENEAU, Frédéric, KEVORKIAN, Sandrine, CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), PSN-EXP/SES/LMAPS, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de Mécanique et Technologie (LMT), École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS), The French Institute for Radioprotection and Nuclear Safety (IRSN) and the Nuclear Energy Divisionof the French Sustainable Energies and Atomic Energy Commission (CEA/DEN) are kindly thankedfor financial supports. The research reported in this paper has been supported in part by the SEISMParis Saclay Research Institute., Univ Paris Saclay, CEA, CEA DEN SEMT (CEA/DEN-SEMT), Laboratoire de Modélisation et d’Analyse de la Performance des Structures (IRSN/PSN-EXP/SES/LMAPS), Service d'Expertise des équipements et des Structures (IRSN/PSN-EXP/SES), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN), DEN-SEMT, CEA, Université Paris-Saclay (CEA), UNIVERSITE, Institut de Radioprotection et de Sûreté Nucléaire - IRSN [Fontenay-aux-Roses], and CEA-Direction de l'Energie Nucléaire (CEA-DEN)

Subjects
Reinforced concrete, dynamic behavior, [SPI]Engineering Sciences [physics], corrosion, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], earthquake engineering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Corrosion is one of the most common pathologies that affects reinforced concrete structures (RC). The fact that this phenomenon leads to a progressive loss of structural performance does not need further discussions. This loss of performance is a crucial issue for safety, especially when considering the coupling with an external loading such as an earthquake. The present study aims to quantify the time evolution of some quantities of interest, such as the eigenfrequencies, the modeshapes or the damping ratios, as functions of the corrosion degree. To reach this objective an extensive experi-mental campaign has been set up on simple but large-scale RC specimens. The consequences of the corrosion phenomenon on both the static and dynamic behaviors of beams are quantified, considering several steel configurations. In this paper, the experimental campaign is described. Especially, the accelerated corrosion method used is presented as well as the planned loading. The paper ends with a brief description of a simplified model which is under development. Due to its low computational demand, it will be able to be used within the framework of probability safety assessment (PSA) studies

Published
2018

2. A robust and efficient constitutive law to describe the response of quasi-brittle materials subjected to shear-dominated cyclic loading formulation, identification and applications

Author

Richard, B., Vassaux, M., Ragueneau, F., Millard, A., CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique et Technologie (LMT), École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS), The Nuclear Energy Division of the French Sustainable Energies and Atomic Energy Commission (CEA/DEN) and ENS Cachan are kindly thanked for financial supports., The research reported in this paper has been supported in part by the SEISM Paris Saclay Research Instituteand by the ILMAB project (Grant FUI11), E. O. Nate (Ed.), D.R.J. Owen (Ed.), D. Peric (Ed.), and M. Chiumenti (Ed.)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], nonlinear constitutive law cyclic loading, Cast3M, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], unilateral effect, continuum damage, Concrete
Abstract

International audience; In this paper, a new constitutive law aiming at describing the quasi-brittle behavior when subjected to cyclic loading is presented. The proposed model is formulated within the framework of isotropic continuum damage mechanics. The Cauchy stress tensor is split into two contributions one related to the matrix (without cracks) behavior the other related to the crack behavior. This strategy allows accounting for both the crack closure effect and the hysteretic effect in an efficient way making possible large-scale computations. In addition, a specific attention is paid to the way of identifying the material parameters, often requiring complex experimental tests not always easy to carry out. A virtual testing approach based on the use of a discrete element model is used for this purpose.

Published
2015