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采用多刚体结构模拟车辆,空间杆系单元模拟桥梁,建立车桥耦合动力系统。以东水门公轨两用斜拉桥为例,分别采用空间杆系单元模型与空间杆系-板混合单元模型分析了桥梁的自振特性。针对空间杆系单元模型,采用动力时称分析方法,计算了轻轨车和汽车以不同车速通过该桥时的车桥耦合空间振动响应,计算结果表明:两种模型的计算结果吻合较好,桥梁具有足够的竖向与横向刚度,车辆通过桥梁时的舒适性与安全性能满足要求,轻轨车和汽车同时过桥时存在着相互影响。
The multi-body structure simulates the vehicle, the space rod unit simulates the bridge, and establishes the vehicle-bridge coupling dynamic system. Taking Dongshuimen rail-rail dual-purpose cable-stayed bridge as an example, the natural vibration characteristics of the bridge are analyzed by using the spatial rod element model and the space-rod-plate hybrid element model respectively. According to the space unit model, dynamic analysis method is used to calculate the vibration responses of the vehicle-bridge coupling space when the light rail vehicle and the vehicle pass the bridge at different speeds. The calculation results show that the calculated results of the two models agree well, With sufficient vertical and horizontal stiffness, the comfort and safety performance of vehicles passing through the bridge meet the requirements. There is an interaction between the light rail vehicle and the vehicle when crossing the bridge at the same time.