地震作用下高速铁路桥梁的动力响应及行车安全性研究

将桥梁在地震作用下的运动方程和车辆振动方程，通过桥梁子系统与车辆子系统间的非线性轮轨接触关系联系起来，建立可考虑多点激励与行波效应的车桥系统地震反应动力学分析模型。以某高速铁路连续梁桥为例，对非一致地震激励下桥梁结构的动力响应及桥上车辆运行安全性进行研究，提出确保地震发生时高速列车在桥上安全运行的临界速度限值，可供实际工程设计时参考。

Dynamic Responses of High-Speed Railway Bridges and Running Safety of Vehicles during Earthquakes

The dynamic model of coupled train-bridge system subjected to earthquakes is established by connecting the motion equations of the bridge under earthquakes and the vehicles through the nonlinear contact relations between the wheels and rails, in which the multi-point excitations and traveling wave effects of the seismic waves input from different foundations are considered. Taking a continuous bridge on the planned high-speed railway in China as an example, the dynamic responses of the bridge and the vehicles under non-uniform seismic excitations are researched. The critical safety running speed limits corresponding to different seismic intensities are proposed, which can provide a reference to the practice engineering design.