ANALYSIS ON INFLUENCING FACTORS OF RAIL BRAKING FORCE OF LONGITUDINAL CONNECTED BALLASTLESS CWR ON BRIDGE IN HIGH-SPEED RAILWAY

Longitudinal connected ballastless CWR on bridge are used in several high-speed railways. The researches about that new configuration are scant. The distribution law and influencing factors of rail braking force and deformation are more complex than common continuous welded rail on bridge, so the design is faced with new problem. In connection with the deficiency of existing research, based on the finite element method, the longitudinal-transverse-vertical spatial coupled model is established in this paper. The influencing law of several design factors on rail braking force and deformation is calculated and researched. Analysis results show that under the action of braking, the bigger the sliding layer friction factor on bridge or on friction plate the safer the track and bridge; the influence of the variation of mortar layer rigidity or fastener longitudinal resistance on the mechanical characteristics of the track and bridge is negligible; the force and deformation of part of the track and bridge would be increased obviously by the reduction of track slab/bed plate rigidity, so the craze of concrete of track slab and bed plate should be controlled strongly; for the safe of track and bridge, the pier rigidity should not be less.