Numerical Simulation Of Wind-vehicle-bridge Coupling System Based On Fluid-structure Coupling

When the vehicle running on bridge in the natural wind environment, the vehicle-bridge system composed by vehicle and bridge will affected by aerodynamic forces generated by wind loads which will affected the vibration of vehicle-bridge system, meanwhile the vibration of vehicle-bridge system and the motion of vehicle will change the characteristic of natural wind field which will change the aerodynamic forces on the vehicle-bridge system, so the wind-vehicle-bridge coupling system is build up. The two-way fluid-structure coupling numerical simulation analysis method is adopted in this article to analyze the vibration of wind-car-bridge space coupling system. The main contents of the study are as follow.Using the CFD numerical simulation method to study the vehicle-bridge system of vehicle stationary on bridge and running on bridge. The characteristic of aerodynamic forces of bus, car and semi-trailer three kinds of different vehicle located on different transverse position of bridge with different section forms are researched under wind loads with different wind velocity and different wind yaw angle, and the characteristic of aerodynamic forces of twot vehicle passing eatch other, vehicle running out on bridge out of tunnel and vehicle running through the bridge towers area are also researched. The values and the change ruls of the aerodynamic force coefficients of vehicle under different enviroments are obtained, and the obtained results have guiding significance on the selection of the aerodynamic coefficients of vehicle which is running on bridge.Simulate the vehicle-bridge coupling system based on the ANSYS finite element numerical simulation software. With the time solution solve the vibration differential equation changing with time of all vehicles and bridge system to study the vibration response of the vehicle-bridge system. The influences of running velocities, qualities, numbers of vehicles and longitudinal spacing between vehicles on vehicles and bridge of vehicle-bridge coupling system are researched.Study the wind-vehicle-bridge system based on tow-way fluid-structure interaction numerical simulation method. The wind field characteristics in the spacing around bridge section and vehicles of the wind-vehicle-bridge coupling system and the distribution characteristics of pressures on vehicles are researched under the wind loads with different lateral wind velocity and different vertical wind field models when different number of vehicles running on bridge. The vibration response performances of wind-vehicle-bridge coupling system are researched.The running safety of vehicle in the wind-vehicle-bridge system coupling vibration is evaluated. The distribution law of space fluid field around vehicles and pressure on vehicles which are in the wind-vehicle-bridge coupling system are researched under wind loads with different wind yaw angels. Considering the interaction of natural wind loads and vehicle-brdige coupling system, the rules of the aerodynamic coefficients of vehicles changes with wind yaw angles are researched and the critical wind velocities of overturn and slide of vehicle running on different road condition(dry, wet, snowy and icy) with different velocities under natural wind loads with different wind yaw angles are researched. Meanwhile, the comparative researches are made on the lateral critical wind velocities and the minimum critical wind velocity of overturning and slide vehicles running on bridge. The reasearching method and the conclusions to evaluate the vehicle running sagety in the wind-vehicle-bridge system have reference value.