中文摘要：

风-车-桥耦合振动中通常需要考虑相互气动影响的车辆和桥梁各自的气动力系数，CRH2车型新颖，对风的作用敏感，但其横风气动特性缺乏研究。为考虑车辆和桥梁的相互影响，选取典型的大跨度铁路桥梁断面和典型的中小跨度桥梁断面，利用交叉滑槽系统，测试了车桥组合状态下车辆沿不同类型的桥梁运行时的气动特性。分析了单独车辆情况下的CRH2的气动三分力系数，讨论了雷诺数、车桥组合状态、桥梁类型对车辆气动力系数的影响。试验表明，不同类型桥梁情况下CRH2列车气动特性差异显著，双车交会时，背风侧车风荷载会发生突变。测试所得CRH2客车的气动参数可用于风-车-桥耦合振动分析。

英文摘要：

It is necessary to measure static aerodynamic force coefficients of vehicles and bridge deck in wind-vehicle-bridge coupling vibration analysis. The section of CRH2 train is novel and sensitive to the action of the wind, but the research on aerodynamic characteristics of CRH2 train with cross wind action is rarely introduced. The typical sections of large span railway bridge and small-medium span bridge section are se- lected to investigate the interaction between vehicles and bridges. The aerodynamic force coefficients of vehi- cles are tested using the crossed slot system in wind tunnel for the different combination of vehicle and bridge. Aerodynamic coefficients of CRH2 train without bridge deck are analyzed. Reynolds number, the combination condition of vehicle and bridge, the type of bridge deck section are investigated to demonstrate their effects on vehicle wind loads. The test results show that aerodynamic characteristics of CRH2 train with different type bridges are different significantly, the wind load on the vehicle at leeward side may change abruptly when two trains pass each other. The measured aerodynamic parameters of CRH2 train can be used for the coupling vibration analysis of wind-vehicle-bridge systems.