重载列车过桥时桥梁的垂向动力分析

本文建立了具有6个自由度重载列车的车辆振动分析模型和重载铁路桥梁的梁段单元模型，通过轮轨接触处的位移协调条件与轮轨相互作用力的平衡关系建立了重载车辆-桥梁系统耦合运动方程，采用迭代求解，编制了重载铁路车-桥耦合振动分析程序。对影响重载铁路简支梁桥的跨中挠度的各种因素进行了分析，分析结果表明：列车的轴重、速度、加速度、减速度及轨道不平顺对重载铁路桥梁的跨中挠度和竖向加速度有着重要影响。

Vertical Dynamic Analysis of Bridge for Heavy Haul Train Traveling over Bridge

The model of vehicle vibration analysis of heavy haul train with 6 degrees and beam segment element of heavy haul railway bridges are established, and coupling motion equations of vehicle - bridge system of heavy haul are built up by harmonize condition of displacement and the balance condition of the wheel-rail forces at wheel-rail contact point. Using the iteration, the bridge-vehicle coupling vibration analysis program of heavy haul railway is established. The factors which influence the mid-span deflection of a simply-supported girder railway bridges are investigated systematically. The analysis results show that the axle weight of the train, the speed, the acceleration, the deceleration and rail irregularity have an important influence on the mid-span deflection and vertical acceleration of heavy haul railway bridges.