Research on Mechanical Performance of CRTS III Plate-Type Ballastless Track Structure under Temperature Load Based on Probability Statistics

Abstract

"CRTS III (China Railway Track System III) slab ballastless track structure is one of the high-speed railway ballastless track structures which has Chinese independent intellectual property rights. The mechanical performance of CRTS III slab ballastless trackstructureundertemperatureloadhasnotbeenclearyet.Therefore,throughtemperaturefieldmodelandtemperatureload values selected by statistics analysis based on long-term meteorological data, the mechanical performance of ballastless track structureisstudiedundertwotypicalworkingconditionswithdifferentsafetyprobability.Itisfoundthatthedailyextremevalues ofmonthlyaxialuniformtemperatureandthedailymaximumtemperaturegradientobeycertainstatisticallaws.Inaddition,the maximumtensilestressoftheself-compactingconcretelayerislocatedinthemiddleandedgeoftheslabbottomandthesideof the slab. The maximum tensile stress of the base plate is located at the edge of the surface of the layer and the inner edge of the limitinggroove.Theinterfacenormaltensilestressislocatedattheendandcorneroftheinterface.Furthermore,maximumstress increases with the increase of safety probability. "