列车一斜拉桥系统在风载作用下的动力响应

主要研究脉动风与列车荷载同时作用下斜拉桥的横向振动问题。首先建立了横风作用下并考虑了轨道不平顺和车辆蛇行的车桥系统动力分析模型，推导了体系平衡方程组，编制了有关的计算机程序；根据Ｄａｒｖｅｎｐｏｒｔ风速功率谱模拟产生脉动风样本，并将其作为系统的随机激励，在计算机上模拟列车过桥的全过程，按不同车速计算了桥梁跨中和桥塔的横向位移、加速度以及桥上车辆的横向振动加速度响应。以一铁路斜拉桥为例，着重讨论了在正常使用极限状态下当风速小于３０ｍ／ｓ时的车桥系统动力响应的一些问题。

Dynamic Responses of Train and Cable-Stayed Bridge System Under Wind Action

This paper studies the lateral vibration of cable-stayed railway bridge under train and wind loads.The system model is established,the dynamic equations are deduced,and the computer programs are worked out.By means of Monte Carlo simulation technique,random wind series are generated.Whole histories of train passing through the bridge while the system is acted on by random winds are simulated on computer.The acceleration and displacement responses at the mid-span and the tower top of bridge,as well as the lateral acceleration of train-vehicles are calculated.By taking a real cable-stayed railway bridge as an example,some basic problems are discussed on the dynamic responses of train-bridge system under normal service conditions with wind speed less than 30m/s.