大跨度公轨两用悬索桥风-车-桥耦合振动及抗风行车准则研究  

COUPLING VIBRATION OF WIND-VEHICLE-BRIDGE SYSTEM FOR LONG-SPAN ROAD-RAIL SUSPENSION BRIDGE AND RESISTANT-WIND CRITERION OF RUNNING TRAIN

作　　者：李永乐[1] 董世赋[1] 臧瑜[2] 强士中[1] 

机构地区：[1]西南交通大学桥梁工程系,四川成都610031 [2]上海市政工程设计研究总院,上海200092

出　　处：《工程力学》2012年第12期114-120,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50508036);教育部新世纪优秀人才支持计划项目(NCET-06-0802);四川省杰出青年学科带头人计划项目(2009-15-406)

摘　　要：将风、车、桥三者作为一个交互作用、协调工作的耦合动力系统,基于风-车-桥系统空间耦合分析模型,以一大跨度公轨两用悬索桥为例,采用自主研发的桥梁结构分析软件BANSYS(Bridge Analysis System)分析了风荷载作用下桥梁和车辆的动力响应,讨论了风速、车速及轨道交通布置方式等因素的影响;同时,基于合理的列车运行安全性和舒适性评价指标,对列车通过该桥时的走行安全性与舒适性进行了分析,得出了该悬索桥的抗风行车准则:当风速小于20m/s时,车速可达设计车速80km/h;当风速介于20m/s和25m/s之间时,车速不能大于60km/h;当风速大于25m/s时,应封闭轨道交通。Wind, vehicle and bridge can be regarded as a coupled vibration system. Based on the novel three-dimensional dynamic model of the wind-vehicle-bridge system, the dynamic responses of vehicles and bridge of a long-span road-rail suspension bridge under wind action were analyzed to demonstrate the effects of wind speed, vehicle speed and the layout of track system using the self-developed software, BANSYS （Bridge Analysis System）. Based on the reasonable assessment index, the train running safety and passenger riding comfort across the bridge were studied and the resistant-wind criterion of running train was obtained： the trains can safely pass the bridge with the design speed （80 km/h） when the wind speed is lower than 20 m/s; or no more than 60 km/h when the wind speed is 20-25 m/s; the rail traffic must be closed when the wind speed is above 25 m/s.

关 键 词：风-车-桥系统 耦合振动 抗风行车准则 风荷载 悬索桥 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]