城市轨道交通桥梁发生涡激振动时不仅会影响行车安全，还有可能造成不良的社会影响。首先建立了考虑涡激振动和轨道几何不平顺影响的风-车-桥系统耦合振动分析模型，以某大跨度城市轨道交通自锚式悬索桥为背景，分析了轨道几何不平顺、列车入桥时刻、列车车速、涡激振动振幅及阶次等因素对行车性能的影响。然后，将涡激振动条件下的列车-桥梁垂向系统简化为单自由度模型，推导了车辆加速度响应与涡激振动幅值间的关系式，给出了该桥涡激振动限值的计算公式。结果表明，列车在桥梁涡激振动条件下上桥时，列车响应总体上随车速、桥梁振动阶次和涡激振动振幅的增加而增加，轨道几何不平顺随机性和列车入桥时刻对列车响应也有一定的影响，总体而言，桥梁竖向涡激振动对列车的行车舒适性影响大。推导的关系式考虑了车辆性能，计算结果与风-车-桥系统耦合振动分析结果基本吻合，可为桥梁涡激振动限值研究提供参考。

Vortex induced vibration (VIV) of urban rail transit bridge will not only affect traffic safety, but also cause adverse social impact. Firstly, the coupling vibration analysis model of the wind-vehicle-bridge (WVB) system considering the effect of VIV and track irregularities is established. Take a long-span urban rail transit self-anchored suspension bridge as an example, the effects of track irregularity, the time of train entering the bridge, train speed, amplitude and order of VIV on running performance were analyzed. Then, the train-bridge vertical system under VIV is simplified into a single degree of freedom model. The relationship between vehicle acceleration response and VIV amplitude is derived, and the calculation formula of VIV amplitude limit of the bridge is given. The results show that the train response generally increases with the increase of the train speed, the order of bridge vibration and the amplitude of VIV, and the randomness of track irregularity and the time of train entering the bridge also have a certain influence on the train response. The derived equation takes vehicle performance into account, and the calculated results are in good agreement with the coupled vibration analysis results of WVB system, which can provide reference for the study of VIV amplitude limits of bridges.