Study On Relation Between CWR On Bridge And CRTS â…  Slab Ballastless Track Under Complex Temperature

High-speed railway is an important symbol of railway modernization, which is becoming more of a concern in more and more countries. CWR and ballastless track is a key technology of the high-speed railway, it has wide application foreground because of its high speed, comfort, low maintenance costs for vehicle and track, long service life and a series of advantages. But within just a few years of large-scale operations, because of the complex interaction between ballastless track and CWR, and the influence of temperature gradient and high temperature, extremely cold and other complex temperature, especially for large bridges. As CRTS I slab ballastless track is widely used, a series of diseases appeared such as broken rail, bending rail, destroyed convex retaining block, therefore, to carry out research on the interaction between CWR and ballastless track under complex temperature is of great significance.This paper focusing on CRTS I unit slab ballastless track that used on bridge, based on spatially coupled static and dynamics model, analyses the mechanical behavior of CWR and unit slab ballastless on bridge under the condition of the different temperature gradients, temperature load combinations and diseases. The main results are as follows:(1) The meticulous spatial coupled static and dynamic analysis model is established.Based on the finite element software ANSYS and ABAQUS, a spatial static and dynamic model which has taken geometry and material properties of the track structure into account has been established, solid element is used to simulate the track structure, so that the results will be closer to the real stress state.(2) Analyzing the effect of CWR on ballastless track under different bridge temperatures.Analyzing the force and deformation of CWR and ballastless track under the condition of different temperatures, and the CWR force deformation under different temperature spans, the study shows that CWR and ballastless track have a large deformation under different temperature distribution, and bridge structure effects track geometry with inhomogeneous temperature distribution, the maximum of lateral relative displacement and the vertical relative displacement of bridge are 0.57mm and 0.99mm.(3) Analyzing the relation between CWR and ballastless track under complex temperature.Analyzing the deformation and stress of track structure under different temperature gradients, different temperatures and extreme temperature load combinations, the research results show that the deformation of ballastless track has a great influence on rail longitudinal deformation and stress, when the temperature differential is 25℃, rail longitudinal stress and displacement are 12.18kN and 0.28mm; the temperature of ballastless track effects rail longitudinal deformation and stress significantly, When the track plate temperature increases by 30℃, the rail longitudinal force can reach 29.88kN; at the same time study also analyzes the stress deformation of semicircular convex retaining block at the end of bridge under different conditions.(4) Analyzing the mechanical behavior of unit slab ballastless track and CWR on bridge with diseases.Analyzing the mechanical behavior of CRTS Ⅰ unit type slab ballastless track and CWR on bridge under the conditions of the fastening resistance changes, broken rail, bending rail, destroyed convex retaining block. Research results show that the fastening resistance has a large impact on rail longitudinal forces; convex retaining block damage has a large impact on the longitudinal displacement of track slab, while it has a little influence on the dynamic behavior; bending rail has an obvious effect on static and dynamic behavior, broken rail has a large impact on static and dynamic behavior of track structure; at the same time analyzing the force change of rail when the ballastless track is in maintenance.This thesis analyzed the mechanical characteristics of CRTS Ⅰ ballastless slab track and CWR under complex temperature, then made its interaction relationship clear. And study conclusions provides theoretical guidance for maintenance of the CRTS Ⅰ ballastless slab track and CWR of high-speed railway.