The Analysis Of Vibration Response Of Vehicle-bridge Coupling System For Railway Bridges By UM

With the continuous improvement of the railway network in China,the development of the field and technology of high-speed railway,railway transportation has become an important means of transportation.Acceleration of the train running speed will aggravate the interaction between vehicles and bridges during travel.Therefore,the safety,stability requirements are more stringent in high-speed railway.This paper first reviews the development history of vehicle-bridge coupling theory and the current research status.It elaborates the progress of the study of vehicle-bridge coupling theory from two perspectives at home and abroad.Based on the finite element theory and multi-body dynamics theory,the finite element model of Simply supported box girder,vehicle model and trajectory model are established.And through the macro UM.mac the softwares of ANSYS and UM joint simulation together.Before the simulation analysis,the motivating factors of the vehicle-bridge coupling system are introduced firstly.And it introduces the vibration evaluation standard of vehicle and bridge system,which provides the basis for the follow-up evaluation of dynamic performance.Firstly,24 meters of simple support beam in Qinhuangdao to Shenyang passenger dedicated line as an example for analysis,the analysis of bridge model,vehicle model,orbit model and the setting of simulation condition parameters are introduced.The simulation results were evaluated to meet the specified evaluation criteria and compared with the measured value.Then,the vibration responses of the bridge and vehicle at different speeds are studied.With the increase of speed,the dynamic and horizontal amplitude,vertical acceleration and lateral acceleration of the bridge show an increasing trend.The influencing factors of vehicle-bridge coupling system are analyzed.This paper studies the aspects of vehicle(axle load,weight mixing),bridge stiffness(span and pier lateral stiffness),the train running under the geometric orbit irregularity and the damping factors of the bridge.Summed up: The greater the axle load,the smaller the stiffness and damping of the bridge,the stronger the vibration response of the vehicle-bridge system;The derailment factor of the empty truck in the mixed truck is larger and the empty is easier to derail;The short wave in the track irregularity mainly affects the safety of driving,and the long wave affects the stability and comfort;At the same time,the influence of various factors on the dynamic coefficient is analyzed at different speeds.When the speed reaches the resonance speed,the damping factor can effectively reduce the dynamic coefficient,play a very good shock absorption effect.