Dynamic response of a track-subgrade system under moving train loads and non-uniform ground motions

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (18) : 297-305.

WANG Chenggong， YANG Guotao

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Abstract

In order to study the law of dynamic response of the track-subgrade system under the coupling effect of moving train loads and non-uniform ground motions, a three-dimensional refined finite element model was established with Beijing-Shanghai high-speed railway and CRH3 train as the research objects, and the dynamic response analysis of track-subgrade system under combine earthquakes and moving loads was carried out. The non-stationary ground motion is synthesized by multiplying the stationary ground motion time history by the envelope function. The effects of train operating speed, axle weight and magnitude of non-uniform ground shaking on the dynamic response of track-subgrade system are analysed parametrically. The results show that the response amplitude of the track-subgrade system does not increase with the increase of train speed, and there is a range including the critical speed, in which the stronger vibration of the track-subgrade system will occur under the coupling of moving train loads and non-uniform ground motions. With the increase of train axle load or the PGA of ground motion, the track-subgrade system shows a more significant vibration response. Compared with uniform excitation, the maximum vertical displacement and the maximum vertical acceleration of the track slab appear earlier under non-uniform excitation.

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high-speed railway / non-uniform excitation / critical speed / seismic response / combine earthquakes and moving loads

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WANG Chenggong, YANG Guotao. Dynamic response of a track-subgrade system under moving train loads and non-uniform ground motions[J]. Journal of Vibration and Shock, 2024, 43(18): 297-305

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