Seismic Vulnerability of Interaction Soil-Pile-pier Bridges Under Mainshock-Aftershock Sequences Using the Fragility Methodology

Abstract

Pile foundations strongly influence the performance of supported structures and bridges during a earthquake, only mainshock actions are considered without incorporating the effect of mainshock-aftershock (MA) sequences. This study primarily investigates the seismic fragility of mainshock-aftershock (MA) sequences damaged of bridge with consideration the effect of interaction soil-pile-structure, type of soil and masse effect. Analytical fragility curves are developed for the bridge components based on the outputs of an Incremental Dynamic Analysis (IDA) using 19 synthetic ground motion records. The results indicate that these parameters are significantly influenced on lateral capacity, ductility and seismic fragility on the ISPS. The increasing in the axial load exhibit high probabilities of exceeding the damage state.