考虑地形条件影响的车桥耦合系统地震响应分析

发布时间：2019-05-19 11:21

【摘要】：研究局部地形条件对地震作用下车桥耦合系统动力响应的影响。依据黏弹性边界理论,利用ANSYS建立了可以考虑局部地形条件的三维场地模型,并通过将输入地震动转化为作用于人工边界上的等效荷载来实现波动输入,得到考虑地形影响之后的桥梁各支点地震动时程曲线。将地震激励以速度时程和位移时程形式作用到结构上,编制计算程序,进行多点地震激励作用下的车桥耦合分析。以列车通过总长480 m的实际桥梁为算例,对考虑局部地形影响的车桥耦合系统地震响应进行了仿真分析。结果表明:考虑地形影响后,地震作用下桥梁和车辆的动力响应在峰值大小和峰值出现时间上均发生了改变,且其变化规律随桥梁所处的地形类型的不同而有所差别,说明进行车桥耦合系统地震响应分析时考虑局部地形影响的必要性。
[Abstract]:The influence of local topographic conditions on the dynamic response of vehicle-bridge coupling system under earthquake is studied. According to the viscous elastic boundary theory, a three-dimensional site model which can consider the local topographic conditions is established by using ANSYS, and the wave input is realized by transforming the input ground motion into the equivalent load acting on the artificial boundary. The time history curves of ground motion at each fulcrum of the bridge considering the influence of topography are obtained. The seismic excitation is acted on the structure in the form of velocity time history and displacement time history, and the calculation program is compiled to carry out the vehicle-bridge coupling analysis under multi-point seismic excitation. Taking the actual bridge with a total length of 480 m as an example, the seismic response of the vehicle-bridge coupling system considering the influence of local terrain is simulated and analyzed. The results show that after considering the influence of terrain, the dynamic response of bridge and vehicle under earthquake has changed in terms of peak value and peak occurrence time, and the variation law is different with the terrain type of bridge. It is necessary to consider the influence of local topography in seismic response analysis of vehicle-bridge coupling system.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家973计划项目(2013CB036203) 国家自然科学基金项目(51208027) 中央高校基本科研业务费专项资金资助(2014YJS095)
【分类号】：U441.3

【相似文献】