斜拉-连续刚构组合梁桥车-桥耦合动力响应分析

摘要

Taking a cable-stayed and continuous rigid-frame composite bridge as an example,the vehicle-bridge coupling dynamic analysis model between train and bridge was built and then the spatial vibration equations in matrix form of the system were derived,based on the variational principle of the stationary potential energy and the set-in-right position rule of forming structural matrices.Based on the train runability evaluation,the spatial vibration responses were calculated when the domestic CRH2 train run through the composite bridge at different speeds in order to test whether the bridge has sufficient lateral and vertical rigidity and good operation stability of dynamic characteristics,etc.,meanwhile,the change rule of bridge response at different speeds was studied.The results can provide a reference to correlated bridges for evaluation and analysis.%以某斜拉-连续刚构组合梁桥为例,通过建立列车与桥梁的车-桥耦合动力分析模型,并根据势能不变值原理及形成结构矩阵的“对号入座”法则,导出了车桥系统的空间振动矩阵方程.计算了国产CRH2型列车以不同速度通过该组合体系桥梁时的空间振动响应,基于列车走行性评价指标,检算该桥是否具有足够的横向、竖向刚度及良好的运营平稳性等动力特性,并对不同车速下桥梁响应的变化规律进行了研究,所得结果可为同类桥梁的相关评价分析提供参考.