Aerodynamic characteristics of vehicle-bridge system under cross wind: parameter studies based on wind tunnel test

In order to investigate the effects of vehicle motion on the aerodynamic characteristics of a vehicle-bridge system, a three-vehicle model and a single-vehicle model respectively for full-scale rail transit vehicles and road transit vehicles were designed to measure the aerodynamic forces acting on the vehicles and bridge deck under different testing cases by a self-developed wind tunnel test system with a moving vehicle model. The effects of vehicle speed, yaw angle, rail position of vehicle on bridge deck and vehicle type on the aerodynamic characteristics of vehicles and bridge deck were researched. The results show that vehicle drag and lift coefficients tend to increase with the increase of vehicle speed and the decrease of resultant yaw angle, and vehicle speed has a significant effect on the aerodynamic forces in the single-vehicle model. The effect of rail position on vehicle and bridge aerodynamic coefficients is notable, and bridge aerodynamic coefficients are insensitive to vehicle speed and resultant yaw angle.