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

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。

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

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.