Analysis of Influencing Factors of Welded Turnout Slab with Convex Block of Ballastless Track on Bridge

To figure out the structure and influencing factors of welded welded turnout slab convex block of ballastless track on bridge, according to the characteristics of force and displacement of welded turnout on bridge, the turnout-bridge-platform integration computation model was established by finite element method. Taking the ballastless turnout on a continuous beam bridge as the example, the longitudinal force and displacement of the bridge and parts of the turnout was obtained by the means of changing the numbers of slab, the stiffness of convex block support and the temperature range of slabs. The calculation results indicate: using three slabs is reasonable for the ballastless turnout on bridge; The stiffness of convex block supports on slabs should be set between 250kN/mm and 300kN/mm; Since the change of longitudinal force is very large, while the other parameters change little, with the change of the temperature range of slabs, slabs in turnout should be strengthen.