Aerodynamic Characteristics and Coupling Vibration Mechanism for Wind-vehicle-bridge Systems
Lateral wind is one of the most important influencing factors on train running perform -ance. Many wind induced accidents of rail vehicle have been reported all over the world. With increasing train speed and lighter vehicle body , train is more sensitive to strong lateral wind. In process of high speed train running along the flexible bridge under lateral wind , there is the interaction among wind , vehicle, and bridge, which represents the coupling vibration of wind -vehicle-bridge system. After some existing research is reviewed, the latest advance in the field of wind-vehicle-bridge system is presented, which include aerodynamic characteristics of vehicle and bridge , coupling and failure re mechanism ,the effect of sudden change of wind load. 1. Aerodynamic characteristics. According to the aerodynamic characteristics of ambient flow around vehicle-bridge system, a new test rig with moving vehicle model is developed in a large wind tunnel to respectively measure the aerodynamic force on bridge deck and vehicles while vehicles are running along the bridge deck under lateral wind. According to the rail vehicle and highway vehicle , three-vehicle model and single -vehicle model are used to respectively measure the aerodynamic forces on vehicle and bridge deck at different testing cases by the self -developed wind tunnel test rig. The effects of vehicle speed , yaw angle, rail position of vehicle and vehicle type on the aerody -namic characteristics of vehicle and bridge are studied. The sudden change of vehicle aerodynamic forces are measured by wind tunnel test when vehicle is passing through the bridge tower and two vehicles are passing each other. Aerodynamic coefficients of CRH2 are also measured in wind tunnel. In addition,train induced wind is simulated by CFD. 2. Coupling and failure mechanism. With engineering examples , many parameter studies are carried out to explore coupling mechanism of wind -vehicle-bridge system, including wind field, wind speed, train speed, stiffness of bridge, and vibration of bridge and so on. The control factors in wind-vehicle-bridge system are analyzed for different bridge types. 3. The effect of sudden change of wind load. Under lateral wind action ,wind loads on vehicles and bridge can be changed dramatically when two trains pass each other. The coupling vibration of wind-vehicle-bridge system is simulated for the process of two trains passing each other. The responses of vehicles and bridge are investigated to demonstrate the effect of the spacing of two trains ,wind speed and vehicle speed. Based on the wind field distribution simulated by CFD and the measured aerodynamic coefficients by wind tunnel test , the self-developed analysis software BANSYS is adopt -ed to conduct a contrast analysis for dynamic response of vehicles running through the bridge tower along different rail positions. The above-mentioned research findings and conclusions have been applied in Anqing Yangtze River Bridge, Hanjiatuo Yangtze River Bridge , Tongling Yangtze River Bridge , Shanghai Yangtze River Bridge,etc.
Yongle LI Huoyue XIANG Peng HU Shizhong QIANG
Department of Bridge Engineering , Southwest Jiaotong University , Chengdu 610031, China
国际会议
5th International Symposium on Environmental Vibration(第五届环境振动国际研讨会)
成都
英文
397-410
2011-10-20（万方平台首次上网日期，不代表论文的发表时间）