跨断层铁路简支梁桥地震响应分析

为研究跨断层铁路桥梁的地震响应，基于MATLAB平台，引用公式及参数，合成地震动，然后将人工合成的跨断层地震动输入位移模型中，分别考虑跨断层的方向性效应和滑冲效应，在不同地震动方向作用下进行非线性时程分析。考虑不同设防水准，对桥梁结构内力、位移等进行跨断层地震响应分析，进而研究不同断层距下断层效应影响。结果表明，在顺桥向+竖桥向、横桥向+竖桥向地震作用下，随着断层距的增大，桥墩的内力、支座的变形和桥墩位移的变形都在减小；不同断层距对桥梁的内力、位移变形影响较大，当断层距大于50 km时，断层效应影响较小。

Seismic Response Analysis of Simply Supported Beam Railway Bridge Across Fault

In order to study the seismic response of railway bridges across faults, the MATLAB platform is used to synthesize artificial earthquake wave based on quoted formulas and parameters, and then the artificially synthesized ground vibrations across faults are input into the displacement input model, and the nonlinear time-history analysis is carried out under the different directions earthquake action by considering the faults directional and slip stroke effects, respectively. Considering the analysis of the internal force displacement of the bridge structure with different fortification levels, the cross-fault seismic response is studied, and then the influence of different fault distances on the bridge fault effect is studied.The results show that under the longitudinal + vertical and transverse + vertical direction earthquakes, the internal force of piers, the deformation of bearing and the deformation of pier are decreasing with the increase of fault distance; different fault distances have more influence on the internal force, displacement deformation, etc. of the bridge, and the fault effect has less influence when the fault distance R is more than 50km.