Abstract

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Title:: Influence of Different Pile Foundation Simulation Methods on Seismic Response of Bridge in Liquefiable Ground

Author(s):: ZHU Bing; WANG Chong-chong; WANG Jing; School of Civil Engineering, Southwest Jiaotong University

Keywords:: bridge seismic; seismic response; P-Y curve method; beam-arch composite bridge; time history calculation; liquefied site

Abstract:: In order to investigate the influence of pile-soil interaction and pile foundation soil liquefaction on seismic response of bridge structure, model Ⅰ for the bottom of pier consolidation,whole pile model Ⅱ and model Ⅲ based on m value method and P-Y curve method for a railway bridge with three-span prestressed and continuous beam-arch combination structure in liquefiable site were established by finite element analysis software ANSYS. The vibration characteristics and time history of models were calculated. The results show that the basic modes of the three finite element models are same, and lateral bending is the basic mode of the bridge. The whole pile model Ⅱ and model Ⅲ have the same first 5 modes, which shows that the model analysis of contrast method and application of P-Y curve method were reasonable. The first order frequencies of model Ⅰ, Ⅱ and Ⅲ were 0.836 69, 0.518 95, 0.502 78 Hz. The calculation values of lateral displacement of vault were 0.005 13, 0.020 3, 0.022 1 m. The displacement response values of key locations of structure increase while considering the pile-liquefied soil interaction and liquefied soil nonlinear. The method can provide a reference for the analysis of bridge seismic liquefiable ground in the future.