Study On The Longitudinal Forces Of CRTSⅠ Ballastless Track Slab On Bridge

Based on widely used CRTS I slab ballastless track in China,under the conditions of Trans-sectional Jointless Track,this paper analyses the distribution characteristics of longitudinal forces and longitudinal displacement of it,and convex shape platform's influence on the longitudinal forces and longitudinal displacement.In order to study the distribution characteristics of longitudinal forces of rail,track plates and convex shape platform,in this paper model of bridge,base plate,CA mortar layer,track plates and convex shape platform are simulated with the entity elements.Friction force is considered between CA mortar layer and the upper and lower structure layer,the contact element to simulate this simulation.Rail is be simplified the euler beam,fastener longitudinal resistance is simulated by nonlinear spring,resin stuffing and the pier stiffness is simulated by linear spring.This model coincide with engineering practice well,can be used in minute part research.Besides,this paper established a CRTS I slab ballastless track on bridges finite element model to analysis of the longitudinal forces.This paper analysis of the CRTS I Slab ballastless Track longitudinal static force to simply-supported bridge,including stretching force,rail deflec- tion force,braking force and the rupture force of rails.Considering being- convex shape platform and nonbeing-convex shape platform two condition,it respectively analyse the longitudinal static force of rail and track plates.Besides,it emphatically analyse the characteristic of longitudinal static force of convex shape platform.The results show that the track plate and convex shape platform under a larger force in temperature load can be used as a predominant factor in its design.Convex shape platform can prevent longitudinal displacement of track plate,enabling force of the structure,it can significantly reduce the longitudinal force of rail.The researchs of the detailed structure of convex shape platform have shown that the longitudinal force of it decreases gradually from top of platform to bottom,and,change tendency is obvious along longitudinal of the rail line.This study provides the theories for designing the CRTS I Slab ballastless Track over simply-supported bridge.