The Large Span Arch Bridge Railway Train Take The Feasibility Study

Span deck arch bridge has a wider range of applications; its graceful shape and strong ability make it beyond other railway bridges. With the Jinshajiang Bridge of the Lijiang-Shangri-La new railway as engeneering background, this paper makes a study of the vehicle-bridge coupling vibration of deck arch bridge. The works completed in this paper are as the following:1. With the summary of the development of the span deck arch bridge, vehicle-bridge coupled vibration and vehicle-bridge coupled vibration at home and abroad, it describes the necessity of the study on vehicle-bridge coupled vibration systems.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 finite element model of deck steel arch bridge is established. And the natural vibration characteristics are analyzed.3. Based on the above analysis models, the dynamic responses of the vehicle-bridge system under different conditions are analyzed. And we could come to the conclusion as follow:Jinsha River Bridge has good dynamic characteristics and train running property.4. The dynamic responses of the vehicle-bridge system on different bridge system stiffness are analyzed.We could come to the conclusion as follow:â‘ Increasing the stiffness of bridge deck system in a certain range can reduce the bridge dynamic response.â‘¡The stiffness of piers on arch has not a great impact on bridge and train vibration responses.â‘¢Compared with other parts of bridge, arch ring's stiffness has a great impact on the maximum of bridge displacement responses. Increasing the stiffness of arch ring can reduce the displacement response of the bridge In effect.â‘£Compared with sway bracing, the arch ribs'stiffness has a great impact on bridge vibration displacements. Increasing the stiffness of arch ribs is an effective means of decreasing vibration displacement.