Large-span Steel Truss Arch Train Running Performance

As the advantage of beautiful shape, high stiffness and large spanning ability, The steel truss arched bridge has been widely applied in railway bridge construction in our country. With the constant improvement of train running speed, the problem of vehicle-bridge dynamic interaction has been paid more and more attention.by researchers at home and abroad, so it is necessary to study the dynamic response of large span steel truss arched bridge, the train running performance and operation safety. Taking a large span steel truss arched bridge as engineering background, the bridge's dynamic characteristics and train running performance have been researched in this paper. The works completed in this paper are as the following:1. Summary of the development history of large span steel truss arched bridge and the research of couple vibration at home and abroad, and discuss the necessity of the study on train running performance of large span steel truss arched bridge.2. Based on the principle of total potential energy with stationary value in elastic system dynamics and the "set in right position" rule for formulating system matrixes, the corresponding analysis model and the overall vibration equation of corresponding vehicle- continuous steel truss bridge time dependent system are established.3. Based on the above bridge model, the natural vibration frequencies are calculated. And according to the vibration modes, it makes a study on the dynamic characteristics of the bridge.4. Based on the above analysis models, the vibration responses of vehicle-bridge system under different conditions are detailedly calculated.5. In this paper, it also analyses the effect of some parameters on the dynamic response, which are the structure form of the solid floor and the supporting stiffness.