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.