Influence of arch off-gap on dynamic performance of vehicle-track system of CRTS Ⅱ slab ballast-less track

Abstract

In order to study the influence of the off gap caused by the track camber on the dynamic response of CRTS Ⅱ slab ballast=less track, a vehicle track coupling dynamic model of CRH II was established by using the finite element analysis software ABAQUS. The influence of different off-gap amplitudes on vehicle acceleration, wheel rail vertical force, track structure acceleration and displacement, wheel load reduction rate and derailment coefficient are analyzed. The results show that when the amplitude of the upper arch of the off-gap is greater than 4mm, the vertical acceleration of the vehicle and the maximum wheel rail force change obviously; the influence of the off-gap amplitude on the vibration acceleration of the track plate is obviously greater than that of the rail, but the displacement of both has obvious following property, which is about 0.6 mm; when the off-gap amplitude is 10mm, the wheel load reduction rate exceeds the limit value. The dynamic response of wheel-rail system under different off-gap working conditions can provide a basis for the maintenance of the upper arch under the slab and ensure the traffic safety.