侧风对大跨度城轨斜拉桥车-桥耦合振动的影响及其对策研究  

Effect of crosswind on coupling vibrations of train-bridge system for URRT cable-stayed bridge and its countermeasures

作　　者：何玮 郭向荣[2,3] 朱志辉 He Wei;Guo Xiangrong;Zhu Zhihui(School of Civil Engineering,Anhui Jianzhu University,230601,Hefei,China;School of Civil Engineering,Central South University,410075,Changsha,China;National Engineering Laboratory for High Speed Railway Construction,410075,Changsha,China)

机构地区：[1]安徽建筑大学土木工程学院,合肥230601 [2]中南大学土木工程学院,长沙410075 [3]高速铁路建造技术国家工程实验室,长沙410075

出　　处：《应用力学学报》2021年第3期958-964,共7页Chinese Journal of Applied Mechanics

基　　金：国家重点研发计划(2017YFB1201204);安徽省高校省级自然科学研究重点项目(KJ2019A0744)。

摘　　要：对于城轨斜拉桥的车-桥系统,城轨车辆的气动特性和动力特性不同于普通铁路车辆,而其主梁尺寸和刚度也不同于普通铁路桥梁。考虑到不同类型桥梁和车辆的组合,抗风行车准则也不同,本文针对大跨度城轨斜拉桥,采用风洞试验获取列车与桥梁主梁气动力系数并建立风-车-桥系统耦合振动方程,研究了强侧风对城轨专用斜拉桥车-桥耦合振动的影响并提出了相应的防风对策。结果表明:在强侧风环境下城轨车辆所受侧向风荷载通过轮轨接触间接作用在桥梁上,会对桥梁动力响应产生较大影响;当桥面平均风速低于30m/s时,可以通过降低车速来保证城轨车辆过桥时的行车安全;但当桥面平均风速高于30m/s时,需要在桥面设置风屏障来保证行车安全。For the train-bridge system of cable-stayed bridge for urban railway transportation,the aerodynamic characteristics and dynamic characteristics of urban rail vehicles are different from those of ordinary railway vehicles,and the size and stiffness of the main girder bridge for urban railway transportation are different from that of ordinary railway bridges.Considering different types of bridges and vehicles have different driving rules in strong wind,the aerodynamic coefficients of the train and bridge for urban railway transportation were obtained in wind tunnel tests,and the coupling vibration equations for train and bridge under wind load are established.The effects of strong crosswind on the coupling vibration of train-bridge system of cable-stayed bridge for urban railway transportation and wind resistant measures are studied.The results show that the side wind load of urban rail vehicles is indirectly affected by the wheel rail contact on the girder of the bridge under the strong crosswind,which has a great influence on the dynamic response of the main girder.When the average wind speed of the bridge is 30m/s,it can ensure the running safety of the urban rail vehicle by reducing the speed of the vehicle.When the average wind speed of the deck reaches 35m/s,it is necessary to set wind barriers on the bridge to ensure the running safety of the urban rail vehicle.

关 键 词：城轨桥梁 强侧风 城轨车辆 风-车-桥耦合振动 

分 类 号：U24[交通运输工程—道路与铁道工程]