Structural Analysis And Parameter Study On Longitudinal Connected Ballastless Track On Large Span Bridge

Longitudinal connected ballastless track is a new kind of self-innovated railway track, which use the design concept of German slab track for reference. Main span of the new Beibei Jialingjiang Bridge is 168m. and laid longitudinal connectied ballastless track on it. It's the first time to build such structure on such long span bridge in China even in the world. Therefore, it is good for perfecting the design concept and method of longitudinal connected ballastless track when to do theoretical calculation and analysis, to study the parameter's influence on structure designTo analyze the parameter's influences on track and bridge structure, author used the ANSYS structural analysis software to setup a finite element calculation model of rail-slab-bridge to analysis extensional rigidity of slab, friction coefficient of the slip layer, longitudinal resistance of rail fastening. It select beam and slab temperature stress, braking force, rupture force of rail or slab as the load condition to calculate the variation of the structure force under different parameter value.The study indicates that the extensional rigidity's reduction factor of slab (including the track slab, CA cushion layer and base slab) mainly affect the slab itself and restrict pedestal in the double end of the bridge. It will be good for the whole structure stress when extensional rigidity reduces because the base slab cracks on some extend, friction coefficient of the slip layer mainly affect the slab and restrict pedestal, and take all the structure force into consideration, it is appropriate to choose 0.2 as the slip coefficient. Longitudinal resistance of rail fastening mainly affect rail force and the slit size when rail or slab breaks, and it has very little affection on other structures. So because the on bridge longitudinal connected ballastless track used slip layer with low slip coefficient to reduce the interaction between bridge and track, the ordinary rail fastening can be used to improve the rail force and to restrict slit size.