Mechanism of collapse of tall steel moment-frame buildings under earthquake excitation / Krishnan, Swaminathan in Journal of structural engineering, Vol. 138 N° 11 (Novembre 2012)  

Public ISBD [article]  inJournal of structural engineering > Vol. 138 N° 11 (Novembre 2012) . - pp. 1361-1387 Titre : Mechanism of collapse of tall steel moment-frame buildings under earthquake excitation Type de document : texte imprimé Auteurs : Krishnan, Swaminathan, Auteur ; Matthew Muto, Auteur Année de publication : 2013 Article en page(s) : pp. 1361-1387 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Collapse mechanism Moment-frame buildings Quasi-shear band Plastic analysis Principle of virtual work Damage localization Tall Shear wave propagation beam Earthquake excitation Résumé : The mechanism of collapse of tall steel moment-frame buildings is explored through three-dimensional nonlinear analyses of two 18-story steel moment-frame buildings under earthquake excitation. Both fracture-susceptible and perfect-connection conditions are investigated. Classical energy-balance analysis shows that only long-period excitation imparts energy to tall buildings large enough to cause collapse. Under such long-period motion, the shear-beam analogy alludes to the existence of a characteristic mechanism of collapse or a few preferred mechanisms of collapse for these buildings. Numerical evidence from parametric analyses of the buildings under a suite of idealized sawtooth-like ground-motion time histories, with varying period (T), amplitude (peak ground velocity, PGV), and duration (number of cycles, N), is presented to support this hypothesis. Damage localizes to form a quasi-shear band over a few stories. When the band is destabilized, sidesway collapse is initiated, and gravity takes over. Only one to five collapse mechanisms occur out of a possible 153 mechanisms in either principal direction of the buildings considered. Where two or more preferred mechanisms do exist, they have significant story-overlap, typically separated by just 1 story. It is shown that a simple work-energy relation applied to all possible quasi-shear bands combined with plastic analysis principles can systematically identify all the preferred collapse mechanisms. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000573 [article] Mechanism of collapse of tall steel moment-frame buildings under earthquake excitation [texte imprimé] / Krishnan, Swaminathan, Auteur ; Matthew Muto, Auteur . - 2013 . - pp. 1361-1387. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 11 (Novembre 2012) . - pp. 1361-1387 Mots-clés : Collapse mechanism Moment-frame buildings Quasi-shear band Plastic analysis Principle of virtual work Damage localization Tall Shear wave propagation beam Earthquake excitation Résumé : The mechanism of collapse of tall steel moment-frame buildings is explored through three-dimensional nonlinear analyses of two 18-story steel moment-frame buildings under earthquake excitation. Both fracture-susceptible and perfect-connection conditions are investigated. Classical energy-balance analysis shows that only long-period excitation imparts energy to tall buildings large enough to cause collapse. Under such long-period motion, the shear-beam analogy alludes to the existence of a characteristic mechanism of collapse or a few preferred mechanisms of collapse for these buildings. Numerical evidence from parametric analyses of the buildings under a suite of idealized sawtooth-like ground-motion time histories, with varying period (T), amplitude (peak ground velocity, PGV), and duration (number of cycles, N), is presented to support this hypothesis. Damage localizes to form a quasi-shear band over a few stories. When the band is destabilized, sidesway collapse is initiated, and gravity takes over. Only one to five collapse mechanisms occur out of a possible 153 mechanisms in either principal direction of the buildings considered. Where two or more preferred mechanisms do exist, they have significant story-overlap, typically separated by just 1 story. It is shown that a simple work-energy relation applied to all possible quasi-shear bands combined with plastic analysis principles can systematically identify all the preferred collapse mechanisms. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000573

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