Vehicle Safety And Comfort Research Of Long-span Suspension Bridge Based On Wind-vehicle-bridge Coupling Vibration

Bridge is the throat of traffic,it may suffer a variety of complex wind loads when crossing the sea,river and canyon.The influence of wind on bridges,especially large span bridges,can not be ignored.With the improvement of the service quality of the whole society,people pay more attention to the quality of the trip,and put forward higher requirements for driving safety and comfort.In view of this,this paper has carried out a systematic and in-depth study on the safety and comfort of vehicles on long-span bridges.The main research work includes:(1)The calculation model of Chongqing Tai Hong Yangtze River bridge is established by using the ANSYS finite element analysis software,and the dynamic characteristics of the bridge are analyzed.The fluctuation wind field of the main beam of the Tai Hong Bridge is simulated by the simulation program of the fluctuation wind field compiled by MATLAB,and the pavement roughness simulation program compiled by the MATLAB is used to simulate the roughness samples of three different road condition.(2)An analysis method for vehicle safety on long-span bridges considering the aerodynamic interference between the vehicles and the bridge is established.Based on the wind-vehicle-bridge coupling analysis system,the vertical,pitching and rolling accelerations of the vehicles,and the lateral acceleration of the bridge are calculated and analyzed with and without considering the aerodynamic interference between the vehicles and the bridge for the two typical types of vehicles.Based on the local vehicle model for vehicle driving safety analysis,and considering the driver’s behavior,the local accident analysis program of vehicle driving is compiled with MATLAB;and the global acceleration response of the vehicle and bridge by the whole vibration analysis program is imported into the local accident analysis program,then the side-sliding displacement and the reaction force ratio of each wheel of the local vehicle model are obtained.Criteria for the occurrence of side slip and rollover accidents are used to determine whether the vehicle has an accident.The critical wind speed of van and car at different speeds with and without considering the aerodynamic interference between the vehicles and the bridge can be obtained by increasing the speed and the wind speed step by step.(3)A vehicle comfort analysis method for long-span bridges considering the aerodynamic interference between the vehicles and the bridge is established.Based on the wind-vehicle-bridge coupled whole vibration analysis program,the acceleration response of the vehicle are calculated and analyzed with and without considering the aerodynamic interference between the vehicle and the bridge for the two typical types of vehicles.Based on the vehicle driving comfort analysis method,The vehicle comfort analysis program on the long-span bridge is compiled with MATLAB;and the acceleration response of the vehicle under the global vibration analysis is introduced into the vehicle comfort analysis program to obtain the overall vibration total value for the evaluation of vehicle riding comfort on the bridge,and the comfort of two typical vehicles on the bridge with and without considering the aerodynamic interference between vehicle and the bridge are analyzed,the comfort level of the vehicles on the bridge with and without considering the aerodynamic interference between vehicle and the bridge is given,and the influence of the road roughness,the different wind speed and the different vehicle speed on the comfort of the vehicle is studied.