Three-dimensional Coupling Vibration Of Wind-vehicle-bridge System

A wind-vehicle-bridge system can be regarded as an interaction result of wind-bridge interaction, wind-vehicle interaction and vehicle-bridge interaction, which is determined by nature wind, dynamic characteristics of vehicle and bridge structures, interrelationship between bridge and vehicle dynamic properties and so on. Based on further development of wind-bridge interaction, wind-vehicle interaction and vehicle-bridge interaction, Wind, vehicles and the bridge can be regarded as a coupled vibration system. A state of the art three-dimensional dynamic model of the wind-vehicle-bridge coupling vibration is presented. This research is focused mainly on the following aspects:1, In order to carry out example verification of existing time-domain buffeting theory in the full model wind tunnel test of Hangzhou Bay Bridge, the buffeting-induced structural displacements are measured as well as buffeting-induced internal forces at the bottom of towers by means of arrangement of dynamic strain gauges. Three-dimensional stochastic wind field is simulated by improved WAWS method by utilizing measured turbulence wind spectrums. Spatial correlation is an important factor that would influence buffeting responses. A spatial correlation study is carried out in the wind tunnel test of Hangzhou Bay Bridge and the result is used in simulation of wind field. Furthermore, the approaches to treat various wind loads on the bridge structures are introduced. These approaches are coded to an FEM program and its reliability is verified by variety of examples. In the buffeting analysis of Hangzhou Bay Bridge, the influence of pylon and cable wind field, Sears admittance function, spatial correlation and wind spectrum on buffeting responses are investigated.2,Existing vehicles are properly classified and typical vehicles are chosen to carry out wind tunnel test to get their aerodynamic coefficients. A more realistic and rational dynamic model of vehicles subjected to cross wind by considering the effects of road surface roughness and vehicle suspension system would predict the safety of vehicle due to sudden crosswind gust. The influences of road surface roughness, different road surface condition (dry, wet, snowy and icy) and vehicle suspension system on safety of vehicle are investigated. A series of vehicle accident speeds or critical wind speeds for typical vehicles due to sudden crosswind gust are gained for various road roughness and road surface condition. The ride comfort of vehicles running on the ground under cross wind with various road surface roughness, mean wind velocity, and vehicle speed is assessed.3,Coupling vehicle-bridge vibration system can be treated as two subsystems, one for the bridge and the other for the vehicle, the geometric and mechanical coupling relation between vehicle and bridge are introduced, a separated iterative method is used to work out three-dimensional coupling vibration program, whose...