Aerodynamic coefficient of vehicle-bridge system by wind tunnel test

The changes of three components of aerodynamic force were discussed with the attack angle conver-sion for three kinds of section models. Based on the project of Shanghai Yangtze River Bridge, the wind tunnel test was conducted to obtain its three components of aerodynamic force including 75 conditions of the construc-tion stage, the bridge without vehicles and the bridge with vehicles from - 12 degrees to + 12 degrees. For the bridge with vehicles, the drag force coefficient and the absolute value of both lift coefficient and moment coeffi-cient were decreased by the vehicles. The test result shows that the bridge railing and vehicles have much influ-ence on the three components of aerodynamic force of the vehicle-bridge system for Shanghai Yangtze River Bridge.