9 results on '"Di Lorenzo, Gianmaria"'
Search Results
2. Seismic Retrofitting of Industrial Steel Buildings Hit by the 2012 Emilia-Romagna Earthquake: A Case Study.
- Author
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Formisano, Antonio, Di Lorenzo, Gianmaria, and Landolfo, Raffaele
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INDUSTRIAL buildings , *STEEL buildings , *TUNED mass dampers , *EARTHQUAKES , *EFFECT of earthquakes on buildings , *SEISMIC testing , *CASE studies , *TALL buildings - Abstract
The recent earthquakes have shown the high vulnerability of industrial buildings due to their high exposure. Therefore, this structural typology must be protected in a careful way from seismic events through proper retrofitting interventions. In the paper the application of steel bracings as retrofitting system of an industrial building case study, located in Italy and subjected to the 2012 Emilia-Romagna earthquake, has been done. The analysis results have shown how the inserted bracings are able to improve the structural behaviour under ultimate and serviceability limit conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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3. Non-Linear Analyses and Fragility Curves of European Existing Single-Story Steel Buildings.
- Author
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Formisano, Antonio, Di Lorenzo, Gianmaria, and Landolfo, Raffaele
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STEEL buildings , *STEEL walls , *CURVES , *INDUSTRIAL buildings - Abstract
The recent earthquakes have highlighted the significant seismic vulnerability of industrial steel buildings, which represent structural typologies at high risk due to their noteworthy exposure. In the paper a parametric study on a lot of European existing steel industrial buildings, placed into different geographical areas, having different geometrical dimensions and subjected to diverse crane loads, has been performed through non-linear static analyses. The results have allowed to plot vulnerability curves to be compared to seismic fragility curves derived from literature researches. The comparison among curves has allowed to estimate the effectiveness of the literature studies, as well as to evaluate the seismic damages suffered by investigated structures under different earthquake levels. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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4. Innovative steel 3D trusses for preservating archaeological sites: Design and preliminary results.
- Author
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Di Lorenzo, Gianmaria, Babilio, Enrico, Formisano, Antonio, and Landolfo, Raffaele
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TRUSSES , *STEEL framing , *GLASS construction , *STEEL girders , *STRUCTURAL design - Abstract
Abstract Steel three-dimensional lattice trusses are highly efficient technical solutions to cover large spans, especially when single members are not provided with intermediate restraints able to prevent lateral-torsional buckling phenomena. In the present paper, a compound structure made of steel lattice beams and structural glass slabs is proposed for protection of monumental and archaeological sites. Due to both the risk exposure of monumental heritage to be protected and the use of structural glass, the definition of an appropriate design criterion is mandatory in order to avoid brittle collapse mechanisms. The attention is herein paid to the design procedure, with a brief description of basic ideas behind and the main focus on the parametric capacity design of the structure. The proposed procedure, whose validity is quite general, has been herein implemented by linear numerical analyses, which represent the basic step for further refined analysis aimed at erecting a full-scale prototype to be experimentally tested. Highlights • Steel 3D trusses are a highly efficient technical solution to cover large spans. • A steel lattice beam – glass slab compound structure is proposed for protecting monumental and archaeological sites. • An appropriate design criterion towards vertical loads is proposed in order to avoid brittle collapse mechanisms. • The proposed procedure is verified by linear and non-linear numerical analyses • The results will be used for further refined analysis aimed at erecting a full-scale prototype to be experimentally tested. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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5. Experimental investigations on innovative built-up lattice steel beams.
- Author
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Di Lorenzo, Gianmaria, Terracciano, Giusy, Formisano, Antonio, and Landolfo, Raffaele
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TORSIONAL load , *GLASS construction , *ASSET protection , *STEEL , *BEND testing , *CONCRETE beams , *NONLINEAR analysis - Abstract
Spatial truss beams are an extremely efficient typological solution for covering large spans, especially in the cases where members do not have lateral restraints capable of preventing flexural–torsional buckling phenomena In this study the structural behaviour of innovative steel 3D lattice beams in combination with structural glass slabs, used as roof decks, is investigated for protection of historical assets and archaeological sites. After a brief description of the novel structural system, the attention is focused on the experimental activities carried out for the mechanical characterization of both material and structure. In particular, four-point bending tests are carried out on full-scale prototypes in order to both validate the design procedure and calibrate numerical models useful to extend the achieved results through Geometrically and Materially Nonlinear Analysis with Imperfections (GMNIA analysis). • Four-points bending tests on innovative 3D built-up lattice beams were performed under monotonic loads. • The prototypes showed a ductile behaviour with full yielding of the bottom chord. • The experimental response evidenced the robustness of the design criteria developed by the authors for sizing purposes. • The experimental study allowed for the evaluation of the reliability of some capacity models implemented in Eurocode 3 to predict the elastic and plastic behaviours of systems like those under investigation. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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6. Design procedure for orthogonal steel exoskeleton structures for seismic strengthening.
- Author
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Di Lorenzo, Gianmaria, Tartaglia, Roberto, Prota, Alessandro, and Landolfo, Raffaele
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ANIMAL exoskeletons , *STEEL , *RETROFITTING of buildings , *EARTHQUAKE intensity , *ORTHOGONAL systems , *STEEL walls - Abstract
• The steel exoskeletons could be designed to significantly increase the structural performance of existing structures, providing at the same time useful support for the energy efficiency upgrading and architectural restyling. Indeed, steel exoskeletons are suitable for an integrated and reversible retrofit intervention coherently with Holistic Vision approach. • Currently, there are not encoded design methodologies properly developed for orthogonal steel exoskeletons. • A detailed step-by-step procedure was introduced to cover all the aspects related to the dimensioning of the orthogonal exoskeleton systems designed to increase the structural performance of existing structures. • The efficiency of the proposed design procedure was investigated through non-linear analyses performed on an existing industrial building. The case study is located in Nusco (Av, Italy) which is classified as in medium–high seismic intensity area. • The introduction of steel orthogonal exoskeleton allows to increase both the stiffness and the resistance of the existing building also regularising its dynamic behaviour. The steel exoskeleton systems are widespread structures applied on the external perimeter of an existing building designed to absorb the horizontal actions providing at the same time useful support for energy efficiency upgrading and architectural restyling. The growing interest in the use of exoskeletons is due to the possibility of creating an integrated retrofit (structural, energetic, formal and functional), combining "structural safety" with the concepts of "deep renovation". Among many solutions present in the literature, in the present work, the steel exoskeletons placed orthogonally to the facade of the existing building have been analysed; this structural typology has the advantage to allow rapid retrofit execution without interfering with the activities carried out within the existing structure. In this framework, the aim of the present work is the introduction of a detailed step-by-step design procedure for steel exoskeletons systems adopted for seismic retrofit of existing buildings looking also at the accessibility and operability aspects. Each step of the procedure was individually explained and it was applied for the design of a strengthening intervention on a real single-storey steel industrial building. The existing building is located in Nusco (Av, Italy) which is classified as in medium–high seismic intensity area which corresponds a peak ground acceleration (a g) equal to 0.238 g. Non-linear analyses were conducted to assess the existing structure's performance as well as to verify the effectiveness of the strengthening solutions designed. The use of the exoskeleton systems allows to strongly increase both the elastic stiffness and the resistance of the investigated industrial building without interrupting its product activity. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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7. Iron alloys and structural steels from XIX century until today: Evolution of mechanical properties and proposal of a rapid identification method.
- Author
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Di Lorenzo, Gianmaria, Formisano, Antonio, Terracciano, Giusy, and Landolfo, Raffaele
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IRON alloys , *TECHNICAL specifications , *STRUCTURAL steel , *MECHANICAL behavior of materials , *STEEL alloys , *ENGINEERING standards - Abstract
• The procedure can be used for the identification of historical steelworks. • A database of material properties was setup from literature and standard documents. • The material data can be used for structures with limited knowledge level. • An identification method has been proposed for cast iron, wrought iron and steel. • The procedure can be improved by using non-destructive testing (NDT) method. Mechanical properties of materials, as provided by current design standards, are the pre-requisites for the proper identification and structural assessment of existing buildings and civil engineering works. For mechanical characterisation, in case of "Limited Knowledge" (KL1) without direct information on the material properties, the usual features according to the standards at the construction time are considered. This is the case, for example, of structural metalworks characterised by historical and artistic interest (bridges, roof galleries, covered markets, railway stations, etc.) or industrial archaeology buildings where, because of the constraints imposed by the National Authorities of Cultural Heritage Preservation, extensive or exhaustive in-situ tests cannot be performed. This paper focuses chronologically, from the XIX century until today, on the evolution process of ferrous alloys, namely cast iron, wrought iron and steel, for structural applications. After a description and classification of the aforementioned materials and their production processes, the main mechanical properties and design stresses for bending and compression elements are briefly analysed and collected in a chronological order. Reference is made to the product specifications and design codes, integrated with data from extensive experimental testing. The resulting database can support realistic assumptions about materials and their properties, used over a range time of over 100 years, once the age of building is known. Finally, a methodology for identifying existing metal carpentry structures, which combines the database with fast non-destructive testing methods, is proposed. Such an approach can be effectively used not only for historical steelworks, but also for the mechanical characterization of structural subsystems or elements (e.g. beams, columns, lintels, tie rods) in common existing buildings made of either steel or steel-rc composite structure. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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8. Seismic strengthening of isolated RC framed structures through orthogonal steel exoskeleton: Bidirectional non-linear analyses.
- Author
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Prota, Alessandro, Tartaglia, Roberto, Di Lorenzo, Gianmaria, and Landolfo, Raffaele
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STEEL framing , *NONLINEAR analysis , *STRUCTURAL frames , *ANIMAL exoskeletons , *SOLUTION strengthening , *GROUND motion - Abstract
The catastrophic effects of recent earthquakes around the world have highlighted the vulnerability of civil buildings; in Europe, most of the existing buildings were built after World War II and since they have largely exceeded their useful life, are characterized by a high vulnerability linked both to the durability of the materials and to the lack of seismic provisions in design. The current trend in constructional field is to design interventions aimed at the seismic and energy improvement of these structures jointly, in order to achieve a sustainable and integrated retrofit intervention. To this aim, the use of 2D orthogonal steel exoskeletons for the seismic strengthening represents a suitable solution, providing at the same time an enhancement in thermal insulation, through a 'double-skin' solution. Due to the growing interest in the design of steel exoskeleton interventions, a detailed dynamic characterization of this external strengthening solution is needed. In this framework, the present work, aims to investigate the effectiveness of the investigated strengthening solution by means of bi-directional non-linear dynamic analyses. Extensive numerical analysis was carried out. The selected case-study is an Italian existing pre-1980 s RC frame building located in Mugnano di Napoli (NA, Italy), which is a medium-high seismic hazard site in Italy (peak ground acceleration equal to 0.156 g). Two alternative strengthening solutions were numerically investigated by means of non-linear time-history and incremental dynamic analyses performed applying fifteen bidirectional ground motions on three-dimensional numerical models. The results of the dynamic non-linear analyses allow to quantify more appropriate performance indicators, both in terms of expected demand and overall collapse capacity, useful for the development of optimization strategy and design of exoskeleton system. The results highlighted that both the investigated strengthening scenarios allow to increase the stiffness of the existing building and allow it to meet the current code safety requirements reducing also the residual inter-storey drift. The obtained results are not strictly related to the investigated case study, but can be extended to all the structures retrofitted that follows the presented design procedure. • The catastrophic effects of recent earthquakes around the world have highlighted the vulnerability of civil buildings. • Due to the interest in the design of exoskeleton, a dynamic characterization of this strengthening solution is needed. • The strengthening of an existing RC structure with EXO-S-2D placed orthogonally to the building façade is presented. • The efficiency of a displacement-based design procedure is validated by means of static and dynamic non-linear analyses. • The results of the dynamic non-linear analyses allow to quantifyperformance indicators of the strengthened intervention. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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9. Leeb Hardness Experimental Tests on Carpentry Steels: Surface Treatment Effect and Empirical Correlation with Strength.
- Author
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Formisano, Antonio, Chiumiento, Giovanni, and Di Lorenzo, Gianmaria
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STEEL , *NONDESTRUCTIVE testing , *TENSILE tests , *SURFACE preparation , *REINFORCED concrete , *STATISTICAL correlation - Abstract
The diagnostic tests on materials and constructional components are commonly classified as destructive, weakly destructive and non-destructive. The destructive and weakly destructive tests provide local quantitative information on the basis of direct measurements of mechanical, physical and chemical parameters, while the non-destructive tests allow extensive investigations for the detection of indirect magnitudes correlated to the material characteristics of interest. The non-destructive tests for a correct analysis of the artefact degradation status were spread since the 80s aiming at both reducing the number of destructive interventions and operating inside buildings without suspending normal activities of residents. With reference to steel buildings, non-destructive tests are not largely diffused as for reinforced concrete, but they could be very useful to limit before the extraction of members from the structures to be subjected to tensile tests and after the consequent repairing interventions. Therefore, in the current study micro-hardness tests have been carried out on steel samples having different treatment of surfaces in order to evaluate the relative hardness and resistance changes. Finally, the hardness measurements, converted into Brinell and Rockwell scales, have been put in comparison to resistance values extracted from the ASTM standard conversion table for evaluating the trend of the resulting curves useful to setup future correlation laws. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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