Research On The Mechanism Of Longitudinal Interaction Of Welded Tunrout On Bridge

High-speed railway represents a railway tendency of modern construction allaround the world, to increase train speed is the only condition on railway forexistence and society for accommodation. It is being popularized and applied byincreasingly more countries by virtue of its incomparable advantages. However, dueto the request of environmental protection and district restriction, the bridge stationinevitably arises, and thus laying seamless turnouts on the bridge, even the seamlessturnouts cluster, is an important issue in the progress of continuously weldedrail(CWR).Based on the construction of seamless turnouts and the constraints amongseamless turnouts, non-ballasted track and bridge, the thesis establishes a finiteelement model of turnout-bridge-pier. I analyze the force and deformation of each railon the seamless turnout and the single crossover turnout, forces and displacementsof primary force-transfer parts under the temperature load, rail temperature, differentdegrees of fastener resistance reduction and temperature difference between adjacentrailway lines and turnouts. Then I summarize some research results of thisdissertation:(1) under the effect of temperature load, due to the force transfer of limitstopper and filler, the additional temperature stress on the stock rail is the maximumin the limit stopper, and the forces on the stock rail are more complicated than otherrails.(2) The transformed extent of rail temperature in seamless single turnout orsingle crossover turnout is great, but it can’t destroy the internal construction.Compared with the seamless single turnout, the rail temperature of single crossoverturnout is lower when the limiter composite blocks of seamless single turnout getcloser.(3) As the reduction of fastener longitudinal resistance, the displacements ofeach rail in the seamless turnout become farther, thus the forces of force-transfer parts(limit stopper and filler) become larger.(4) The seamless turnout and its neighborlines(or other seamless turnout) exist the different rail temperature, seamless lineswill transfer larger temperature stress to the seamless turnouts, so exist temperature stress between two turnouts.The research results of this dissertation will offer reference to theoretic support,schematic design and local construction of the seamless turnout on bridge.