竖向涡激振动对大跨度城市轨道专用桥行车性能的影响研究  

Effect of vertical vortex induced vibration on running performance of a long-span urban rail dedicated bridge

作　　者：向活跃 王一少 蔡佩宏 李永乐 XIANG Huoyue;WANG Yishao;CAI Peihong;LI Yongle(State Key Laboratory of Bridge Intelligent and Green Construction,Chengdu 611756,China;Chongqing Rail Transit(Group)Co.,Ltd.,Chongqing 400010,China)

机构地区：[1]桥梁智能与绿色建造全国重点实验室,成都611756 [2]重庆市轨道交通(集团)有限公司,重庆400010

出　　处：《振动与冲击》2024年第24期251-258,共8页Journal of Vibration and Shock

基　　金：重庆市建设科技计划项目(城科字2022第5-3号);国家自然科学基金(52322811)。

摘　　要：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。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。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,当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 a urban rail transit bridge will not only affect traffic safety,but also cause adverse social impact.Firstly,the coupling vibration analysis model of a wind-vehicle-bridge(WVB)system considering the effect of VIV and track irregularities was 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 was simplified into a single degree of freedom model.The relationship between vehicle acceleration response and VIV amplitude was derived,and the calculation formula of VIV amplitude limit of the bridge was given.Results show that the train response generally increases with 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 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 the WVB system,which can provide reference for the study of VIV amplitude limits of bridges.

关 键 词：城市轨道交通专用桥 涡激振动 耦合振动 风-车-桥系统 行车安全 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]