According to the CRTSII bi-block ballastless track structure commonly used in high-speed railway, a 3D finite element model of CRTSII bi-block ballastless track structure on viaduct is established. Then characteristics of vertical displacement of the rail in frequency domain and dynamic responses of the ballastless track structure can be obtained by transient dynamic analysis, based on the finite element software (the speed of the train are 200, 250, 300 and 350 km/h respectively). Analysis results show that: (1) Without considering track irregularity, the frequencies corresponding to the peak of the vertical displacement of rail are approximately equal to the multiples of v/La, so the peak frequency can be adjusted by changing the speed when the length of a train is certain; (2) The vertical displacement of the track slab is less than 60% of the rail, and its vertical acceleration is only 2.1%, showing that fasteners play a good effect on reducing vibration; (3) Without other damping measures except fasteners, the vertical displacements of the track slab, supporting layer and viaduct are very close, but their vertical accelerations are some different; (4) The speed of the train has a great impact on the vertical acceleration, and the maximum vertical accelerations of the rail, track slab, supporting layer and viaduct at 350 km/h are 1.68, 1.82, 1.96, 1.65 times of 200 km/h respectively; (5) The vertical compressive stress of the track structure has a turning point.
Dynamic Response Analysis of CRTSII Bi-Block Ballastless Track on a Viaduct of a High-Speed Railway
Fifth International Conference on Transportation Engineering ; 2015 ; Dailan, China
ICTE 2015 ; 1019-1025
25.09.2015
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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