中文摘要：

确定车辆和桥梁各自的气动参数是车-桥耦合振动分析的基础。为研究主梁断面形状对车辆和桥梁气动特性的影响，利用自制的三分力分离装置-交叉滑槽系统，针对8种分离式双箱主梁断面进行多工况模型风洞试验。通过对不同模型及工况试验结果的对比，讨论不同主梁断面形状下车-桥系统的雷诺数效应，得出不同行车位置处车辆和桥梁各自气动参数随主梁宽高比的变化规律以及其阻力系数的取值方法，为后续抗风设计及风-车-桥耦合振动研究提供参考。

英文摘要：

Determining the aerodynamic coefficients of both bridge deck and vehicle is the basis of coupling vibration analysis of vehicle-bridge systems. In order to investigate the influence of bridge deck cross section shape on the aerodynamic characteristics of a vehicle-bridge system, using a crossed slot system, a self-made three-component aerodynamic force separating equipment, wind tunnel tests are carried out for 8 separated twin-box girders with different section geometries. Comparing the test results, the effect of Reynolds number is discussed, and variation of static aerodynamic coefficients of both the vehicle at different rail positions and bridge deck with different beam height to width ratios is explored. A method of calculating the drag coefficient is summarized to provide a reference for future resistant- wind design and analysis of coupling vibration of wind-vehicle-bridge systems.