Vulnerability assessment of buildings based on the pseudo-dynamic testing method with sub-structuring: application to progressive collapse
Essais pseudo-dynamiques avec sous-structuration pour l'analyse de vulnérabilité des bâtiments : application à la perte de portance
Résumé
Due to various natural or anthropogenic hazards, buildings’ structural members can
lose their bearing capacities which can lead to the building’s progressive collapse. The latter
subject is of growing interest regarding the socio-economic context [1]. Academic research
on progressive collapse took off in the early 2000s, with the 9/11 attacks on the Twin Towers
(NY, 2001) [1]. Analyses on large structures are mainly done numerically. On the other side,
most experiments are lead on smaller structural elements. Until now, these experiments have
been limited by dimensions, dynamic forces and real-time control capabilities. In earthquake
engineering, the pseudo-dynamic method (PsD) is often used [2]. Experimental tests are performed
quasi-statically on a structural part, while the inertial forces are computed within a
time integration scheme. An extension of the method is the sub-structured PsD trials, which
consists of inserting the tested part in a larger finite element mesh. Sub-structuring enables
accounting for the whole structure’s effect on the tested part [3]. The paper presents a first experimental
campaign, which validated the interest of the approach on a simple structural part.
Another experimental campaign is underway, on larger structural members to further comfort
the method’s validity to study progressive collapse.
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