列车通过连续钢桁梁桥时的动力响应研究

将列车-连续钢桁梁桥视为一个耦合的整体系统,采用桁段有限单元对连续钢桁梁桥进行离散,每节车辆采用具有21个自由度的二系弹簧车辆空间振动模型,列车与连续钢桁梁桥通过轮轨相互作用关系进行动力耦合,应用弹性系统动力学总势能不变值原理,建立列车-连续钢桁梁桥时变系统的整体振动方程;采用直接积分法计算了列车以不同速度通过2座连续钢桁梁桥时的桥上列车振动响应全过程,分析计算所得结果,可以得出2座桥梁行车安全的结论.

Dynamic Responses Research of the Train Traveling Through Steel Continuous Trussed Girder Bridge

The computational problems of the dynamic responses of train traveling through the large-scale span steel continuous trussed girder bridge is studied. The train-steel continuous trussed girder bridge system is regarded as a coupled integrated system. The steel continuous trussed girder bridge is idealized by the finite truss elements. The train structural idealization is the two-stage suspension vehicle space dynamic model with 21 degrees of freedom. The dynamic coupling is conducted by the interaction between the train and the steel continuous trussed girder bridge via wheel tracks. The global vibration equations of the train-bridge time varying system are derived by the principle of total potential energy with stationary value in elastic system dynamics. The dynamic response of the train traveling through two steel continuous trussed girder bridges at various velocities is calculated by the direct integration method. The results show that these bridge are safe when train traveling through the bridge.