Abstract

Info

Title:: Applicability Research on Multi-support Excitation Input Model of Bridges Crossing Fault

Author(s):: HUI Ying-xin; WANG Ke-hai; HE Wen-jie; School of Civil Engineering and Hydraulic Engineering, Ningxia University

Keywords:: multi-support excitation; bridge crossing fault; displacement input model; acceleration input model

Abstract:: In order to study the applicable ground motion input analysis model for bridge crossing fault (BCF), the seismic response of multisupport excitation displacement input model and acceleration input model of large mass method were calculated respectively with a BCF as an example, and the applicability of two models and the reasons of model error were discussed. The results show that displacement input model can consider the influence of permanent ground displacement on seismic response of structures, and the residual internal force and deformation of bridge pier of BCF after ground motion can be truly reflected. The displacement input model is suitable for the multisupport excitation seismic response analysis of BCF. However, without considering the residual internal force and deformation, the calculation results by acceleration input model of large mass method can be unreasonable and unsafe. When using the general finite element software to analyze multisupport excitation of acceleration input model, whether there is a permanent ground displacement in the displacement time history corresponding to the input acceleration time history should be checked firstly. If there is permanent ground displacement, it is recommended to use the displacement input model to calculate, otherwise it will be possible to obtain the distortion calculation results.