The Research On Vehicle-bridge Coupling Vibration For The Bridge Of Beijing To Tianjin Railway

The train running on the bridge can cause the vibration of the bridge and the vibration of the bridge can in turn affect the motion of the train. This is called'vehicle-bridge coupling vibration'. With the speed of trains increasing and the bridge structure being employed in the high-speed railway, to study the dynamic interaction between trains and bridges becomes more important. Thus, more and more attention is paid to research on vehicle-bridge dynamic analysis and it is necessary to analyze the'vehicle-bridge coupling vibration'.Based on the general study of historic and current researches in China and abroad in the field of train-bridge interaction system,the space three-dimensional dynamic interaction model of the train and high-speed railway bridge is established by the vehicle subsystem, the bridge subsystem and the wheel-track subsystem. The analysis program is compiled in this thesis and the dynamic response of high-speed railway vehicle-bridge coupling system is studied.Firstly, for the vehicle subsystem, a space vibration analysis model constituting of such rigid bodies as carriage, bogie frame and wheel is built. The dynamic analysis models of the train are established. For the bridge subsystem, the dynamic analysis models of the bridge was established by the finite element method.Then, Germany's Low disturbance track spectrum is simulated by the the trigonometric series.Secondly,for the wheel-track subsystem, the detailed geometric relation of contact are given,and the wheel-rail contact geometry nonlinear factors on the wheel-rail forces of the vehicle-bridge coupling system are analyzed. In the determination of the wheel-rail forces, the tangential wheel-rail forces is treated by the creep theory , and the normal wheel-rail forces is treated by the iterative method. Then,the geometry conditions and the mechanical balance compatibility between the vehicle and bridge are elaborated.Thirdly, vehicle subsystem and bridge subsystem is connected with wheel-rail forces,and the dynamic equations of vehicle and bridge are sloved by the separation of iterative method. The numercial methods (the Newmark-βmethod) which are used to solve the oscillatory differential equations of train and bridge system are given. The vehicle-bridge dynamic analysis program is worked out and the process how the program works is introduced in this paper.Last but not least, dynamical response of the vehicle-bridge coupling of Tianjin Xinkailu Bridge of Beijing-Tianjin high-speed railway is analysised .And the effects of train running speed, the track irregularity ,the double vehicles,the horizontal wind and the wagons on coupling vibration of the vehicle- bridge system are studied.