The Mechanics Analysis Of Continuous Bed Slab Of Ballastless Track Of Switch

This thesis mainly analyzed the constrained characteristic and structure carrying capacity of the solid concrete bed of ballastless switch by using the finite element analysis method. Because switch's structure itself is irregular, this thesis used the solid element to build the finite element model of the solid concrete bed of ballastless switch. The model was built according to the design parameter of the 18th rail switch of the Passenger-Dedicated Lines. It used the structure of Rheda non-ballasted track system, the switch rail and movable frog of rail system were simplified, used Euler-beam element and half of the space between fasteners as the element length to simulate the rail, used the linear spring element to simulate the fastener and the foundation, used a bogie load to carry on the vertical load analysis of deformation and the stress of the bed slab.First, the load was applied on the straight and side line of the entire switch step by step to analyze its deformation and stress characteristic. And then the result was used to determine the most disadvantageous stress conditions. The carrying capacity of bed slab was analyzed in each condition, further considers the influence of temperature stress and the crack control. It can be found the vertical displacement and respectively stress of bed slab of ballastless switch appears the non-uniform distribution along the line through the analysis, but all of them were in the allowable range of carrying capacity.Next, in view of each kind of factor which influence bed slab stress to analyze the deformation and stress, such as choose different stiffness of fastener and foundation, different size and thickness of each layer of bed slab, different material of bed slab. The analysis result indicated that the vertical displacement and carrying capacity of bed slab of ballastless switch were influenced by the all...