Full-Scale Dynamic Collapse Tests of Three-Story Reinforced Concrete Buildings on Flexible Foundation at E-Defense

Abstract eng:
E-Defense, the world largest three-dimensional earthquake simulator, has been operated and available for shake table tests since 2005. A five-year national project on seismic safety of urban areas has started from 2002, as a part of which seismic performance of existing reinforced concrete (RC) buildings were investigated through the full-scale shake table tests at E-Defense in 2005 and 2006. The second phase tests were conducted for two three-story school buildings with flexible foundation from September to November 2006. One was a bare RC specimen simulating an old and non-ductile school building in Japan and the other was a retrofit specimen strengthened with attached steel braces. The two specimens were tested with the following specific objectives: (1) the simulation of progressive collapse of existing school buildings, (2) verification of strengthening effect by the attached steel frames, and (3) soil-structure interaction with flexible foundation. The observed seismic performances and the measured responses of the two specimens in the shake table test are presented in this paper mainly focused on the failure mechanisms with the effects of the base conditions.

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