本文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。依据粘弹性边界理论，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480m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 topography on the dynamic response of train-bridge system under earthquake is studied. According to the theory of viscous-spring artificial boundary, a 3-D finite element model of site accounting for the topographic effects is established by using the ANSYS. The process of wave input is realized by transforming the seismic time history into equivalent loads acting on the artificial boundary, by means of which the seismic time history at each support of bridge can be obtained. The dynamic analysis of a train-bridge system subjected to multi-support seismic excitations is carried out, in which the velocity and displacement time histories of seismic excitations are exerted on the bridge supports. With a train passing through a 480m bridge as a case study, the dynamic responses of train-bridge system under earthquakes considering local topography are analyzed. The results show that the dynamic response of the train-bridge system changes on the peak value as well as the time of peak appearance, and the variation rule changes as the type of site where the bridge is located changes, demonstrating that it is necessary to consider topographic effects in dynamic analysis of train-bridge system under earthquakes.
关键词
车桥耦合系统 /
动力分析 /
地震作用 /
地形效应 /
粘弹性人工边界
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