Studies On Railway Bridge Coupled Vibration Of Train Rail-Bridge System Under The Influence Of Creep

In recent decades,high-speed railway in china is developing rapidly,bring huge benefits to our country.Based on this background,research the coupling vibration between the vehicle, rail and bridge,ensure the safty and comfort of the train and security of the bridge is very meaningful. High-speed train passing through the bridge will cause the vibration of the bridge structure through the contact between wheel and rail, and vibration of the bridge structure affects the vibration of the vehicle in turn. This interaction and influence is the coupling vibration between the vehicle, rail and bridge. Although there are many theoretical methods about vehicle - rail - bridge coupling vibration, most of those focus on the dynamic response of vehicle systems. That means complex caculation and time-consuming. This thesis summarize and absorb the results of previous studies, deduce a new element which is based on euler-bernoulli beam with finite element method and principle of virtual work,make a vehicle - rail - bridge coupling vibration program with the MATLAB language, analyze the vehicle - rail - bridge coupling dynamics problem of 24m railway bridge. The main achievements of this thesis are as follows:1,We unite the degree of freedom of the vehicle, rail and bridge by finite element method. Formulize and obtain a new vehicle-rail-bridge element and the dynamic equations and dynamic matrix expressions. Then make the dynamic analysis program with the MATLAB language.2,We analyze the 24m bridge common used in the railway bridge by the method above-mentioned, and discuss the dynamic response of the bridge system based on different speed and considering the creep or not.the results show that train speed and the dynamic response of bridge are not necessarily monotonic relationship, the creep have little influence on the dynamic response of the small span simply supported bridge.In this paper, we analyze the 24m bridge based on different speed and considering the creep or not.In the future,we may analyze the dynamic response of long span bridge considering the creep or not.