横风作用下公路车辆与桥梁静气动力的数值模拟研究

Numerical simulation on static aerodynamic forces of vehicles and bridges under cross winds

横风作用下的风—车—桥耦合系统的振动分析需要准确识别车辆和桥梁气动参数。基于CFD数值仿真平台分别建立了桥梁单体模型和车桥耦合体系模型,计算分析了高低紊流度风场中不同风攻角下车辆和桥梁的静气动力,分析研究了静止车辆对桥梁静气动力的影响、风攻角对车辆静气动力的影响以及风场的紊流性对车桥静气动力的影响。计算结果表明:由于车辆的干扰,不同风攻角下的桥梁静气动力普遍增大;风攻角对车辆静气动力系数影响比较大;紊流特性对车辆静气动力系数有一定影响,对桥梁静气动力系数影响不大。

The exact identification of the aerodynamic parameters of vehicles and bridges needed for the coupling vibration analysis of the wind-vehicle-bridge system.The model of bridge and the model of coupled system of bridges and vehicles were built and the static aerodynamic forces of bridges and vehicles at different wind attack angles in high and low turbulence wind fields were calculated by the method of computational fliud dynamics（CFD） in this paper.The influence of vehicles on the static aerodynamic forces of bridge,the influence of wind attack angles on the static aerodynamic forces of vehicle and the influence of turbulent characteristics on the static aerodynamic forces of vehicle and bridge were investigated.The results show that the static aerodynamic forces of bridge at different wind attack angles are larger due to the interference of the vehicle.The wind attack angles have great influence on the static aerodynamic force/moment coefficients of the vehicle.The turbulence has some influence on the force/moment coefficients,but almost has no influence on those of the bridge.