JIANG Li-zhong, YU Jian, ZHOU Wang-bao, FENG Yu-lin, PENG Kang, ZUO Yong-jian. STUDY ON GEOMETRICAL IRREGULARITY OF RAIL INDUCED BY TRANSVERSE EARTHQUAKE[J]. Engineering Mechanics, 2022, 39(2): 1-13. DOI: 10.6052/j.issn.1000-4750.2021.05.ST01
Citation: JIANG Li-zhong, YU Jian, ZHOU Wang-bao, FENG Yu-lin, PENG Kang, ZUO Yong-jian. STUDY ON GEOMETRICAL IRREGULARITY OF RAIL INDUCED BY TRANSVERSE EARTHQUAKE[J]. Engineering Mechanics, 2022, 39(2): 1-13. DOI: 10.6052/j.issn.1000-4750.2021.05.ST01

STUDY ON GEOMETRICAL IRREGULARITY OF RAIL INDUCED BY TRANSVERSE EARTHQUAKE

  • As an important lifeline for earthquake relief, railway transportation has undertaken extremely important transportation tasks during the earthquake relief period and post-disaster reconstruction period. Research on the rail irregularities caused by earthquake is the basis for ensuring the safety of train after earthquakes. A finite element model of China Railway Track System (CRTS) Ⅱ high-speed railway beam bridge was established and experimental verification was carried out. 40 seismic waves were selected from the PEER database, which had the highest matching degree with the design response spectrum. The distribution law of rail irregularity after transverse earthquake was studied. Based on random vibration theory and hypothesis testing principle, a method to determine the power spectral density curve of seismic induced rail geometric irregularity was proposed, and sampling of seismic induced rail geometric irregularity was constructed. The results show small amplitudes in residual gauge, vertical and cross-level irregularity and large amplitude in residual alignment irregularity; the residual alignment deformation is mainly concentrated in the area about 200 meters away from the subgrade; the track irregularity characteristics in the rest space are relatively stable, which can be predicted by a small space sample; the residual rail irregularity within 200 m near the subgrade should be processed as non-stationary signal, and the track irregularity in the rest space can be processed as stationary signal approximately; the power spectral density of stationary rail residual irregularity at each frequency obeys logarithmic normal distribution, and the power spectral density of non-stationary rail irregularity at each time frequency node obeys logarithmic normal distribution.
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