Seismic performance evaluations of SSI system due to aftershocks

Abstract

Aftershocks can increase the damage and possibility of structural collapse soon after a major earthquake. When it is considered whether the structure should be repaired or not after a major earthquake, it is necessary to estimate the influence of aftershocks on mainshock-damaged structure and the likelihood for occurrence of aftershocks shortly after the main shock. In the present study, the damage evaluations of simplified SSI system with the influence of aftershocks are examined. Besides, methodologies for evaluating the collapse probability of mainshock-damaged structure shortly after the main shock by considering the likelihood for occurrence of aftershocks are proposed. It is shown that the proposed estimation method can effectively evaluate the collapse probability of structure due to aftershocks.