Bridge Welded Turnout Temperature Stress And Displacement Of Ballasted Track

Welded turnout is one of the most important parts in continuously welded rail, which can improve the speed and stability of the vehicles. The structure of welded turnout is complex, and calculation of longitudinal forces and displacements of tracks in turnout areas are basis of design,construction and maintenance of welded turnout. With the development of high speed railway and urban rail transit, welded turnouts are laid on bridge, longitudinal force and displacement in tracks of welded turnout become much complex. Researches of welded turnout on bridge are imperative. This paper does much research on the continuous welded turnout on ballastless bridge because much ballastless track are laid on high railway.Based on the finite element principle, the calculation model of temperature stress and displacement of continous weled turnout on ballastless bridge was established. According to the characteristic of the elements in ANSYS, different elements are choosed to simulate the bridge, rail, tie, fastening, ballast, spacer block, and restricting device so on. Analysis and calculation are carried out on the temperature stress and deformation of NO.18 welded turnouts on simple-supported beam bridge and continuous beam bridge by using the model and appropriately parameters selected. Through contrasting with the result of continuous welded turnouts on rodebed and continuous welded turnouts on slab track and on bridge. We get the characters of the forces and displacements of continuous welded turnouts on ballastless bridge.Using the same method, the calculation model of temperature stress and displacement of crossover on ballastless bridge was established, we get the characters of the force and displacement of crossover on ballastless bridge. The intermediate straight line's influence to crossover was analyzed ,and the variation laws was studied.Some parameters influencing the temperature stress and displacement of continous welded turnout on ballastless bridge were studied, such as the rail temperature, the beam temperature, the fastener resistance, the gap of spacer, the rigidity of turnout tie, the length of beam.