Influence of sleeper spacing on mechanical properties of cast-in-place steel spring floating slab track bed

Abstract

In order to study the influence of sleeper spacing on the mechanical properties of steel spring floating slab track bed, taking a subway project as an example, the finite element static model of steel spring floating slab track established by finite element software is used to simulate the action of train load, and the stress and deformation characteristics of rail and floating slab concrete under three load combinations and 335 calculation conditions are analyzed. The research shows that: (1) When there is no lateral force, the stress and deformation of the rail under the designed sleeper spacing(DSS) are basically the same as that under the imaginary sleeper spacing(ISS); when the lateral force acts, the regular sleeper spacing can reduce the deformation of the track structure to a certain extent. (2) The lateral and vertical axle load have little influence on the displacement of steel spring floating slab. The relative variation difference under different sleeper spacing is less than 5%, but the relative variation amplitude of concrete stress of floating slab is about 20%. (3) Based on the analysis results of stress and deformation characteristics of rail and floating slab, the relative difference of rail deformation and stress is less than 5%, the stress increment amplitude of floating slab is less than 0.35Mpa, and the relative difference of displacement is within 12%.