Abstract
This paper examines the effect of structural deformation on the unit slab-type ballastless track structure of high-speed railway. The principle of stationary potential energy was used to map the relation between girder vertical deformation and rail deformation considering the effect of subgrade boundary conditions and the nonlinear contact of interlayer. The theoretical model was verified by comparing with the finite element analysis and experimental results. The theoretical model was used to analyze the effects of several key parameters on the rail deformation, such as vertical deformation amplitude, elastic modulus of the mortar layer, and vertical stiffness of the fasteners. The results show that the track slabs suffered significant disengagement, which makes the deformation of the track structure at the position of the beam joint tend to be gentle when nonlinear contact between the mortar layer and the track slabs was considered. The track slabs disengagement mainly occurs near the beam joints (the side of the deformed beam). As the deflection amplitude of the girder increases, the track deformation, the fastener forces and the disengagement length of the track slabs are obviously nonlinear. When the vertical stiffness of the fastener and/or the elastic modulus of the mortar layer increase, the fastener force and the track plate disengagement length increase monotonically and nonlinearly, which will adversely affect the life and safety of the track structure.
Highlights
At present, high-speed railway (HSR) is being rapidly developed [1,2]
Under multiple dynamic loading due to trains, foundation settlement, earthquakes, etc., the bridge structure would inevitably suffer from residual deformation [7,8,9,10], such as pier settlement, bearing deformation, etc
The track and girder structures are simplified as a single composite beam, in which the track slabs were vertically supported by springs, regarded as free beams with two free ends, without mutual connection along the longitudinal bridge direction; the base plates and girder are firmly connected via embedded rebars
Summary
High-speed railway (HSR) is being rapidly developed [1,2]. In particular, ballastless track structures offer several advantages, including relatively low maintenance requirements, high strength, good stability, and high smoothness [3,4]. Lateral and vertical deformation of the supported bridge and the track deformation, Chen et al [24,25,26,27] developed an analytical solution for the mapping relation between the theoretical formulae were derived and verified through experimental results and finite pier settlement of supported bridge and rail deflection to analyze the dynamic element analysis [28,29]. The accuracy of the theoretical mapping model in this paper was verified through comparing the experimental results and the finite element model (FEM) established in ANSYS Based on this theoretical model, the effects of the amplitude of vertical bridge deformations, vertical stiffness of the fasteners, and elastic modulus of mortar layer on track geometry were analyzed quantitatively
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