Analysis Of Longitudinal Force In Continuous-Slab-Track In Long-Span Bridge

With the help of the bed plate of longitudinal connection,continuous-slab-track on bridge can remove the unfavorable influence on track structure caused by the rotation angle of beam end. Setting slide layer is a good measure to reduce the interaction between the rail and bridge, and rail expansion joint on long span bridge can be cancelled. So this design thought can offer importance reference and directive significance to construction of ballastless track on long span bridges.Based on the principle of bridge-track interaction and the finite element method,the paper uses beam element and spring element to each simulate structure sheaf, builds the calculation model of longitudinal force in continuous-slab-track on long-span bridge.Moreover, and takes a superstructure of 94m+168m+84m simulatingconstruction of continuous rigid frame bridge as anexample,caculates additional longitudinal forces transmission undermultiple working conditions(braking-bending forces,temperature stress and board-breaking force) in bridge, analyses the influence of sliding friction coefficient,Expanding-Contracting changes of stiffness of slab (bed plate) and abolishing shear pin. The calculating result are as follows.(1) The temperature load of continuous-slab-track structure over long span bridges controlling for long-span bridge,but the effects of braking-bending force cannot be ignored. The rigid connections Part of bed plate and terminal spine will be slab breaken easily, so the paper suggests that bed plate and terminal spine not to use the rigid connections form, instead of elasticity form, reducing the force of bed plate and terminal spine. The force of broken plate should be the main control loads of the shear design of concretion institutions.(2) Sliding friction coefficient,Expanding-Contracting changes of stiffness of slab (bed plate) has a significant effect on the bridge-track interaction, then it is best for the stress in continuous-slab-track on long-span bridge to reduce the sliding friction coefficient and slab (bed plate) cracking in a reasonable range; Therefore, the sliding layer failure and slab (bed plate) cracking case should be considered in the prior stage of design.(3) It is advantage for the force of bed plate to cancel concretion institutions, but under the action of temperature force the limiting value of longitudinal force of terminal spine will be increasing greatly; So it's necessary to setup concretion institutions on long span bridges.While considering the worst-case of two trakcs board- breaking at the same time; After cancelling concretion institutions, the longitudinal horizontal force of bridge Pier's top was influenced most by the force of broken plate is to down-range of 78%, so I suggest that the shear design of concretion institutions should be assure that when the continuous-slab-track on long-span bridge occure the worst-case of board- breaking, concretion institutions is nipped together, to guarantee the safety of the bridge.This study provides the theories for designing the continuous-slab-track over long span bridge of passenger railways...