Documents disponibles écrits par cet auteur

Hierarchical structures for a robustness-oriented capacity design / E. Masoero in Journal of engineering mechanics, Vol. 138 N° 11 (Novembre 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 11 (Novembre 2012) . - pp.1339–1347. Titre : Hierarchical structures for a robustness-oriented capacity design Type de document : texte imprimé Auteurs : E. Masoero, Auteur ; F. K. Wittel, Auteur ; H. J. Herrmann, Auteur Année de publication : 2013 Article en page(s) : pp.1339–1347. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Frames  Progressive  collapse  Robustness  Hierarchy Résumé : In this paper, the response of two-dimensional framed structures made of rectangular cells to the sudden removal of columns is studied. A simulation algorithm based on the discrete-element method is employed, where the structural elements are represented by elasto-plastic Euler-Bernoulli beams with elongation-rotation failure threshold. The effect of structural cell slenderness and of topological hierarchy on the dynamic residual strength after damage R1 is investigated. Topologically hierarchical frames have a primary structure made of a few massive elements, while homogeneous frames are made of many thin elements. It is also shown how R1 depends on the activated collapse mechanisms, which are determined by the mechanical hierarchy between beams and columns, i.e., by their relative strength and stiffness. Finally, principles of robustness-oriented capacity design that seem to be in contrast to the conventional antiseismic capacity design are addressed. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000437 [article] Hierarchical structures for a robustness-oriented capacity design [texte imprimé] / E. Masoero, Auteur ; F. K. Wittel, Auteur ; H. J. Herrmann, Auteur . - 2013 . - pp.1339–1347. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 11 (Novembre 2012) . - pp.1339–1347. Mots-clés : Frames  Progressive  collapse  Robustness  Hierarchy Résumé : In this paper, the response of two-dimensional framed structures made of rectangular cells to the sudden removal of columns is studied. A simulation algorithm based on the discrete-element method is employed, where the structural elements are represented by elasto-plastic Euler-Bernoulli beams with elongation-rotation failure threshold. The effect of structural cell slenderness and of topological hierarchy on the dynamic residual strength after damage R1 is investigated. Topologically hierarchical frames have a primary structure made of a few massive elements, while homogeneous frames are made of many thin elements. It is also shown how R1 depends on the activated collapse mechanisms, which are determined by the mechanical hierarchy between beams and columns, i.e., by their relative strength and stiffness. Finally, principles of robustness-oriented capacity design that seem to be in contrast to the conventional antiseismic capacity design are addressed. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000437

Progressive collapse mechanisms of brittle and ductile framed structures / E. Masoero in Journal of engineering mechanics, Vol. 136 N° 8 (Août 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 8 (Août 2010) . - pp. 987-995 Titre : Progressive collapse mechanisms of brittle and ductile framed structures Type de document : texte imprimé Auteurs : E. Masoero, Auteur ; F. K. Wittel, Auteur ; H. J. Herrmann, Auteur Article en page(s) : pp. 987-995 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Frames  Concrete  structures  Progressive  collapse  Discrete  elements. Résumé : In this paper, we study the progressive collapse of three-dimensional framed structures made of reinforced concrete after the sudden loss of a column. The structures are represented by elastoplastic Euler-Bernoulli beams with elongation-rotation failure threshold. We performed simulations using the discrete element method considering inelastic collisions between the structural elements. The results show what collapse initiation and impact-driven propagation mechanisms are activated in structures with different geometric and mechanical features. Namely, we investigate the influence of the cross sectional size and reinforcement alpha and of the plastic capacity beta of the structural elements. We also study the final collapse extent and the fragment size distribution and their relation to alpha, beta, and to the observed collapse mechanisms. Finally, we compare the damage response of structures with symmetric and asymmetric reinforcement in the beams. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Progressive collapse mechanisms of brittle and ductile framed structures [texte imprimé] / E. Masoero, Auteur ; F. K. Wittel, Auteur ; H. J. Herrmann, Auteur . - pp. 987-995. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 8 (Août 2010) . - pp. 987-995 Mots-clés : Frames  Concrete  structures  Progressive  collapse  Discrete  elements. Résumé : In this paper, we study the progressive collapse of three-dimensional framed structures made of reinforced concrete after the sudden loss of a column. The structures are represented by elastoplastic Euler-Bernoulli beams with elongation-rotation failure threshold. We performed simulations using the discrete element method considering inelastic collisions between the structural elements. The results show what collapse initiation and impact-driven propagation mechanisms are activated in structures with different geometric and mechanical features. Namely, we investigate the influence of the cross sectional size and reinforcement alpha and of the plastic capacity beta of the structural elements. We also study the final collapse extent and the fragment size distribution and their relation to alpha, beta, and to the observed collapse mechanisms. Finally, we compare the damage response of structures with symmetric and asymmetric reinforcement in the beams. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]