基于性态的液化场地多跨桥梁桩基地震响应分析

In order to describe the performance of the multi­span simply pile­supported bridge system in liquefiable ground, the analytic expression of the hazard curve of the performance index is derived, which takes into account the uncertainty of the seismic randomness, the uncertainty of cognition, and the uncertainty of the seismic hazard curve. The finite element model is performed through inputting base motions with different amplitudes. The seismic re­sponse of the multi­span simply pile­supported bridge system in liquefiable ground is carried out by using the ground motion intensity index PGV/PGA. Based on the results of finite element analysis, the maximum of displacement and bending moment in typical locations during the earthquake is selected. By the linear fitting in the log­log coordinate, the seismic demand model and seismic hazard curve for the different performance indexes are obtained, and then the response characteristics are analyzed. This work can provide necessary reference for the seismic design of similar bridge engineering.