Analysis Of Vibration Characteristics Of Railway Bridge Vehicle-bridge System

In recent years,the construction of high-speed railway in in our country is in full swing,the high-speed railway mileage continues to increase,and the driving speed is also rising with the development of science and technology.However,trains passing through the bridge at excessive speed will intensify the vibration of the systems,therefore,it is necessary for the bridge to have the performance to ensure the smooth passing of the train.This article first introduced the research progress of different scholars in different countries on the theory of the vehicle-bridge coupling and the method adopted in the analysis for the article.In this paper,the parameters and the solution of the force are introduced,and the equations of each subsystem and the equations of the coupling system are established respectively,and use the relevant theory to give solution.In order to analyze the dynamic indicators obtained,the national standards for the evaluation of vibration response indicators are enumerated,the national standards for the evaluation of vibration response indexes are enumerated,which lays the foundation for the evaluation of the simulation results later in this paper.In addition,the subsystem model parameters and the dynamic characteristic simulation software UM for simulation analysis are introduced.Finally,the 24 m,32 m simply-supported box girder in Qin Shen section was taken as the main research object to carry on the simulation,and the vibration performance of the simulation result was compared with the measured value respectively,and the comparison resultproves that the model reliability.According to the change of the system response under the speed adjustment,it is concluded that the driving speed of the moving group increases the vibration response of the system.The factors that influencing the dynamic response of the coupling system are studied from three aspects:the bridge aspect(stiffness,damping ratio and span);Vehicle(different number of vehicles,different axle weights);Initial conditions on the train before the bridge(the distance from the train to the front of thebridge).By changing the parameters of the model,the effects of the three factors listed above on the dynamic response of the bridge across the middle are analyzed and relevant conclusions are drawn.It is hoped that these conclusions in bridge design,vehicle design,and bridge dynamic performance evaluation have guiding significance and use value.