Abstract
This paper presents a numerical study on the dynamic responses of the non-ballast track structures under the high-speed train load that is excited by the rail irregularity at the welded rail joint. In this study, a multi-body dynamics model with 10 degrees of freedom is built to model a high-speed vehicle and a finite element model is established to simulate the non-ballast track. A mathematical model is also given to characterize the geometry of the local rail irregularity at the welded rail joint. By coupling the high-speed vehicle model and the track model and taking the mathematical model of the welded rail joint as an input, the dynamic responses of the non-ballast track structures under a rail vehicle running at a high speed are simulated and discussed in this paper. The wheel/rail force and the rail and slab vibration acceleration are investigated to demonstrate the significant dynamic effects on the track structures due to the welded rail joint.
Highlights
The continuous welded rail track has been extensively adopted in railways all over the world for a long time [1]
When the welded rail track is used in the high-speed railways, the dynamic effects that the local rail irregularities at the welded rail joints have on the high-speed trains and track structures should be carefully investigated
The welded rail joints may cause distinct dynamic effects to the trains and the track structures when they are applied to the high-speed railways
Summary
The continuous welded rail track has been extensively adopted in railways all over the world for a long time [1]. The welded rail joints provide much better rail surface transition between adjacent rail segments relative to the conventional joints, there are still local rail irregularities at the welded rail joints [5]. Those local irregularities always have very short wavelength and small amplitudes. The dynamic responses of the non-ballast track structures when a rail vehicle passing a welded rail joint area at a high speed are simulated and discussed. DYNAMIC RESPONSES OF NON-BALLAST TRACK STRUCTURES SUBJECTED TO HIGH-SPEED TRAIN LOADS AT THE WELDED RAIL JOINT.
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