Ren, Juan-Juan ; Wang, Peng ; Liu, Xue-Yi ; Liu, Jia (2011)
Braking Forces and Displacements of Longitudinally Counpled Ballastless Welded Turnout on Bridges.
In: Journal of Southwest Jiaotong University, 24 (1)
doi: 10.3969/j.issn.0258-2724.2011.01.008
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

A finite element model of turnout-track slab-bridge beam-pier was established to analyze the forces exerted on ballastless track and welded turnout on bridge and their displacements under braking forces; in which a single crossover (composed of 2 sets of No.18 welded turnouts; the longitudinally coupled ballastless track; the bridge beam and the pier are regarded as one system.The welded turnout of longitudinally coupled ballastless track on Leida bridge on Wuhan-Guangzhou high speed passenger line was taken as an example. Calculation results show that braking forces on and displacement of the stock rail increase with a decrease in the slab stiffness; and the displacement between the slab and the rail is less than 1 mm. The structure of the ballastless track has a little effect on the longitudinal forces exerted on the position-limited devices and spacers; and the displacements of nose rail and switch rail. Braking forces do not result in contact between the two blocks of the position-limited device; and the forces exerted on them are less than 13 kN. A decrease in slab stiffness reduces the forces exerted on it; with a maximum value of 3 832.9 kN; and increases its displacement; with a maximum value of 17.4 mm. Decreasing slab stiffness and friction coefficient of slip layers increases the forces exerted on the piers; and when the friction coefficient is less than 0.2; the longitudinal forces exerted on the piers decreases by about 500 kN.

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