Influential Factors Analysis Of Longitudinal Force On Bridges With CRTS Ⅱ-Type Slab Ballastless Track

With the rapid expansion of high-speed passenger dedicated line, ballastless track is developing quickly for its advantage of high stability, less maintenance workload and relatively mature technique. The wide use of ballastless track becomes the development trend of high-speed railway.Researches on techniques of ballastless track have to be enhanced for its wide application in passenger dedicated line. The researches relate to structure design, construction method and later maintenance which aim to optimize the economic benefits so that ballastless track can become system engineering.Taking simple supported beam bridges as an example, a spatial model of line bridge piers considering nonlinear track-concrete is established in this thesis to analyze the longitudinal force of CRTSⅡ-type slab ballastless track. The thesis analyzes the magnitudes and variation of maximum longitudinal forces of the rail, track slab, piers and terminal spines changing some parameters such as the friction coefficient of slip surface, the length and coefficient of friction slab, the stiffness of terminal spine. Simultaneously the test of the slip surface's friction coefficient is done in the condition such as the breakage or frost of geotextile. the influence of whether to consider nonlinear track-concrete for longitudinal forces of the rail, track slab, piers and terminal spines is also compared. The most favorable length of the friction slab and the most favorable stiffness of terminal spine are respectively 75m,50 MN/mm as put forward in the thesis.