以某大跨度采用槽形主梁的非对称式独塔斜拉桥为工程背景,建立由斜拉桥和桥上通行列车组成的空间耦合振动分析模型,在建立槽形主梁模型时采用槽形薄壁梁段有限元法.根据势能不变值原理及形成桥梁结构矩阵的"对号入座"法则,导出该车桥系统的空间振动矩阵方程,计算 CRH2列车以不同速度通过该桥时的桥梁及车辆振动响应,并对不同车速下桥梁响应的变化规律进行研究.计算结果表明:采用槽形主梁的非对称式独塔斜拉桥具有足够的横、竖向刚度,CRH2列车以不同速度驶过桥梁时,各项振动响应输出值均在限值以内,桥梁整体动力性能良好,列车过桥时的走行性亦能很好地满足.%By taking a dissymmetrical single pylon cable-stayed bridge that uses channel beam as main girder as an example and using channel thin-walled beam elements to build main girder model, a vehicle-bridge coupled dynamic analysis model between train and bridge was established. According to the principles of total potential energy with stationary value in elastic system dynamics and the "set-in-right-position" rule, the space vibration equations in matrix form of the vibration system were derived, the dynamic responses of bridge and vehicle were calculated when the CRH2 train passing through the bridge at different speeds, and the change rule of bridge response at different speeds was studied. The calculation results show that: the cable-stayed bridge with single tower has enough horizontal and vertical stiffness levels, the vibration responses are within the limits when CRH2 train passing through the bridge at different speeds, and that the overall dynamic performance of bridge is good and train running safety is guaranteed.
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