Mechanic Analysis And Test Research Of Longitudinal Connected Ballastless Track On Long Span Bridge

With the construction of passenger railway line, there will be a great deal of ballastless track built on bridges. The new Beibei Jialingjiang River is the first bridge which adopt longitudinal connected ballastless track. It is the first time to build longitudinal connected ballastless track on such long span bridge in our country even in the world, and some design concepts, design methods , materials are innovatively used. Therefore, it has vital significance for consummating the design method to analyze the theoretic calculation and study the experimentation.To reseach the longitudinal interaction between track and bridge, a calculational model with rail-slab-bridge was established by the structure analysis softwear ANSYS, and with witch, temperature force, braking power, rupture force of the rail-slab-bridge system was caculated. The calculational results show that temperature force is the key load of longitudinal connectede ballastless track.Secondly, the static experiment of the ballastless track was discussed. The static experiment consists of temperature force of the base slab, the relative displacement between base and bridge, the force of the restrict dado and the bridge-slab connected framework. The results indicated that variation law of the test item above was basically the same, they all augmented as the temperature increases.Lastly, the static experiment of the ballastless track was also discussed. The dynamic experiment has mainly following aspects: (1) the dynamic parameters of the track, (2) the safety stock of the track structure under different running conditions, and (3) the force and distortions of the WJ-7 fastener, validate its design parameters, and provide reference to optimize the structure design, meanwhile to afford important basis for the fastener form selecting. The test results indicated that the longitudinal connected ballastless track on the new Beibei Jialingjiang River bridge met the demand of traveling security. The slip layer has actualized its slippage and reducing the interaction between bridge and slab, and has met the design require.