Calcuation And Analysis For CWR On Bridge Based On The Whole-Bridge Model

The continuous welded rail on bridges can reduce the amount of rail joints, improve the condition of bridges and rails , decrease the maintenance, and prolong the life of rails and bridges, it has gained enormous technical and economic benefit. Paving the continuous welded rail on railway bridges causes the longitudinal forces between the bridges and rails, the forces are the main loads of railway bridge .If the interaction between the bridges and rails is oversized, it will cause a series of problems of rails and menace the safety of traveling train. So the calculation of the continuous welded rail on bridges has much important meanings.The continuous welded rail on bridges is a interacted whole system, any change of the track, bridge and it' s piers will influence the loading of the other two, it is a harmonious change system, therefore, we should set up the whole model of the track, bridge and it's piers.This thesis on the basis of absorbing the study achievements home and abroad has used UIC parameters, established the whole-bridge and double-track model, calculated the combination of various of loadings of double-track bridge and compared with the result of our country. The main contents are as follows:(1) Selecting the UIC code parameters, using Ansys software to establish the whole-bridge and double-track model, and having used the finite element method to calculate the interaction between rails and bridges.(2) Taken 5-span 32m simple-deck bridge as an example, using the established model to calculate the expansion and contraction forces, the flexibility force, the braking and acceleration forces, break forces between bridges and rails and so on.(3) Analyzing the basic character of the longitudinal additional stresses of the continuous welded rails on the multiple-span simple-bridge. studied effect of the stiffness of the piers,fixed-support,the friction of the active-support and beam temperature on the interaction between the track and bridges .(4) Using the BCWR software, the domestic parameters are adopted , calculated the longitudinal forces of the 5-span 32-metersimple-deck bridge and compared the result to the whole-bridge and double-track model, analyzed the differences and sameness of calculation method of the continuous welded rail on bridges home and abroad(5) Put forward reasonable suggestion for the design of the continuous welded rail on bridges...