TEMPERATURE WARPING AND TRAIN-TRACK DYNAMIC ANALYSIS OF CRTS II SLAB BALLASTLESS TRACK

Abstract eng:
CRTS II ballastless slab track is widely adopted in high-speed railways in China. The influence of temperature induced deformation of CRTS II slab track on the running safety of high-speed trains is an important issue to be considered. With the temperature field of track slab simulated by applying temperature load on the track slab nodes, the warping of CRTS II track slab under overall temperature change and temperature gradient is analyzed. By applying the vertical rail displacements caused by the slab warping as the additional rail irregularities, the dynamic analysis model for the train-track system is established, to analyze the dynamic performance of the train. With the additional rail irregularities caused by slab warping under the most positive temperature difference as excitations, the dynamic responses of the track and the train vehicles, such as the wheel-rail interaction forces, wheel offload factor, reaction forces of fastener, as well as the accelerations of rail and track slab, are calculated, when the train passes on the track at the speed of 250km/h. The results show that the dynamic responses are larger, especially the accelerations of rail and track slab when considering the additional rail irregularities caused by temperature warping of track slab.

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