大跨多线铁路钢桁梁桥车桥耦合动力分析

Analysis on Vehicle Bridge Coupled Dynamic of Long-span Multi-line Railway Steel Truss Girder Bridge

为研究列车通过桥面上设置多线铁路的大跨度钢桁梁桥所激发的车桥耦合振动的规律,以某两联2×84m连续钢桁梁桥为研究背景,将列车视为多刚体动力系统,用空间有限元对桥梁进行离散建模,并将列车、桥梁视为联合动力体系,建立列车与多线钢桁梁桥的车桥耦合动力模型,计算分析列车通过该桥时的桥梁动力响应和列车走行性。研究结果表明:当ICE3高速客车、C62普通货物列车混合编组通过桥梁时,桥梁和车辆的动力响应比单线客车通过桥梁时明显偏大;列车在各种组合工况下通过桥梁时,列车走行性能得到满足,桥梁动力性能良好。

In order to study the law of vehicle-bridge coupling vibration induced by train running on a long-span steel truss bridge with multi-line railway on the bridge deck, and taking a two-couple 2×84 m continuous steel truss bridge as the study background, the train is regarded as a multi-rigid body dynamic system, the finite element is used to establish the dispersed model of bridge. The train and the bridge are regarded as the combined dynamic system, and the vehicle-bridge coupled dynamic model of the train and the multi-line steel truss girder bridge is established. The dynamic response of the bridge and the running performance of the train are calculated and analyzed. The results show that the dynamic response of the bridge and the vehicle is significantly larger than that of the single train passing through the bridge when ICE3high-speed passenger car and C62 general freight train are mixed to pass the bridge. The train running performance can be satisfied and the bridge dynamic performance is good when the train passes the bridge in various combination conditions.