列车与刚梁柔拱组合系桥系统的地震响应分析

Earthquake Responses of the Train and Arch Stiffened Bridge system

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 studies the seismic interaction between train and a flexiblearch stiffened steel truss bridge.A dynamic model of the train-bridge system is established. By inputting various earthquake waves to the system the histories of the train passing on the bridge are simulated. Both linear and nonlinear responses of the bridge are calculated. Influences of train loads and substructure stiffness on the seismic responses are studied. Typical analyses on the vehicle and structure responses are performed to estimate the train running stability and the dynamic response property. General features of the displacement, acceleration and other seismic responses of this kind of bridge considering the running train stability are proposed.