Simulation Study on Seismic Performance of Large-Span Bridge Bearings

LIN Zili; XU Yunxi

doi:10.13512/j.hndz.2025.03.15

Abstract：Due to the inability of traditional research on the seismic performance of bridge bearings to simulate different seismic scenarios and parameter changes,and the inability to conduct multidimensional evaluations of the performance of large-span bridges,the seismic performance of large-span bridge bearings is poor.To solve this problem,a large-span railway steel truss arch bridge was selected as the research object.Four different types of supports were selected,and a three-dimensional spatial finite element model of the research object was constructed by using the three-dimensional spatial finite element software Abaqus.The seismic performance of the research object's bearings under different ground motion input conditions was analyzed.The results show that the friction pendulum reduction and isolation bearings have a significant limiting function within the research object,which suppresses the longitudinal bridge deformation level of all bearings within the range of 0.85 m.The research object uses friction pendulum reduction and isolation bearings to exert corresponding constraint effects on the displacement of the main beam under seismic action.Under the influence of ground motion,friction reduction and deformation of isolation bearings are greater than their free path state,and their limiting function is activated to generate longitudinal constraints,resulting in an increase in the seismic internal force value transmitted from the upper structure of the research object to the bridge tower pier.After using friction pendulum reduction and isolation bearings,the research object can achieve collaborative seismic resistance between different bridge piers under different ground motion conditions.The research object maintains an elastic state under different seismic ground motions after using friction pendulum reduction and isolation bearings,which meets the expected seismic target.