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主要讨论地震荷载作用时车桥系统的动力响应特征及对行车稳定性的影响。建立了地震作用下综合考虑输入地震波、轨道不平顺和车辆蛇行运动的车桥体系振动的动力分析模型，推导了体系动力平衡方程组。通过对系统输入各种典型的地震波，在计算机上模拟了列车过桥的全过程动力响应。计算了桥梁的线性和非线性响应，研究了列车荷载及桥梁下部结构刚度对地震响应的影响，以一座刚梁柔拱组合系桥为例，研究地震发生时桥上列车的运行稳定性和这种桥梁的位移、速度和加速度等动力响应特性。
This paper mainly discusses the dynamic response characteristics of the axle system and its influence on the driving stability when the earthquake loads. The dynamic analysis model of the vibration of the axle system considering the input of seismic wave, the track irregularity and the meandering of the vehicle is established under the action of earthquake. The equations of dynamic balance of the system are deduced. Through the input of various typical seismic waves to the system, the whole process dynamic response of train crossing bridge is simulated on the computer. The linear and nonlinear responses of the bridge are calculated and the influence of train load and the stiffness of the lower part of the bridge on the seismic response is studied. Taking a rigid-beam flexible arch composite bridge as an example, the stability of the train running on the bridge during earthquake is studied. The bridge’s displacement, velocity and acceleration dynamic response characteristics.