Study Of Vehicle-bridge Coupled Vibration Of Yachi River Bridge

With the development of railway undertaking, the train speed was continuous increasing, which promoted the appearance of long-span, light, flexible bridges. More and more attention has been paid to the dynamic response of the bridge when high-speed trains running through it. The study of train-bridge system’s vibration response became a representative subject.This thesis reviewed the development of vehicle-bridge coupling and showed the distinction and graphic presentation of different models at every stage. What’s more, the thesis introduced the basic method of FEM (Finite Element Method), the way to form a dynamic equation of bridges, the characteristics of mass matrix, stiffness matrix, damping matrix; and summarized several methods of solving vibration modes. The steps to solve the vibration modes using Lanczos were described in detail. The difference between direct integration method and mode superposition method was analyed in this thesis. In this thesis the steps of mode superposition method were described and the kinetic equations of bridge were established. Some elementary knowledge of multi-body dynamics and the way to establish the model of CHR3were introduced also. There was unique advantage by establishing the model of bridges using ANS YS and forming the model of the CHR3using multi-body dynamics:the model could be established routinely rather than compiled a new program for every bridge and train.Finally this thesis took the Yachihe Bridge for example which established the model of the bridge by ANSYS and formed the model of the CHR3by SIMPACK. The study of vehicle-bridge coupling vibration was implemented by taking the track-rail Irregularities in to consideration that shown the dynamic performance of the bridge and the comfort of CRH3. All these have been done may provide certain theoretical basis for the similar bridges.