Seismic response characteristics of cable-stayed bridge across strike-slip faults
HE Kangwen1, ZHANG Changyong2, LI Huaifeng2, YUAN Wancheng1, DANG Xinzhi1
1. State Key Lab of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
2. Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., Jinan 250000, China
Abstract:To study seismic responses of the cable-stayed bridge crossing strike-slip fault rupture zone, a cable-stayed bridge with a main span of 360 m was taken as a prototype bridge, and 3D nonlinear dynamic finite-element model of the bridge was generated in OpenSees. Three ground motions with permanent displacement from strike-slip earthquakes were selected, and the response characteristics of different components under across-fault ground motion were investigated. The influence of fault crossing effect was studied by comparing the response of cable-stayed bridge in fault-crossing and near-fault, and the seismic responses under different permanent displacement and fault-crossing angles were investigated. The results show that seismic responses of the fault-crossing cable-stayed bridge are significantly larger than that of the near-fault cable-stayed bridge, especially in the transverse of the lower pylon, the longitudinal and transverse of the pier, the transverse bending moment and torsional moment of girder. Besides, there is a large residual deformation of the tower and girder after the earthquake. The permanent displacement and fault-crossing angle have a significant impact on the seismic response. When the angle is not equal to 90°, the longitudinal and torsional responses of the pylon increase significantly with the increase of permanent displacement, and the pylons have extensive longitudinal residual deformation. Therefore, it is beneficial to the tower when the fault-crossing angle approaches 90°, but the transverse and torsional responses of the girder are larger than other angles, and the girder response also increases with the increase of permanent displacement. When the fault and bridge are not perpendicular, the vertical response of girder and the cable force change greatly due to the interaction between towers, girder and cables.
Key words: fault-crossing cable-stayed bridge; strike-slip fault; fault-crossing effect; permanent displacement; fault-crossing angle
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