A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Seismic-Induced Geometric Irregularity of Rail Alignment under Transverse Random Earthquake
As an important lifeline of earthquake relief, railway transportation plays a crucial role in transportation tasks during earthquake relief and post-earthquake reconstruction activities. Determining the representative seismic-induced geometric irregularity of rail alignment is the key to analyzing the safety of train operation after an earthquake. In this study, by taking the high-speed train-CRTS II track-bridge system as the research object, a finite element model was established. From the PEER strong earthquake database, 40 ground motions showing the highest matching degree to the target response spectrum were selected as the ground motion input to establish a sample database of residual rail irregularity after an earthquake. Based on the sample database regarding irregularity, a type of representative seismic-induced geometric irregularity of rail alignment was constructed; the distribution patterns were summarized; and a simplified mathematical model was established, thus providing an irregularity excitation model for analyzing the safety of train operation after an earthquake. According to the research findings, the power spectrum density of the residual rail irregularity after an earthquake at each time-frequency point is subjected to a log-normal distribution. The mean and variance of the power spectrum density set for residual irregularity can be used to generate a definite seismic-induced geometric irregularity of rail alignment. The amplitude of seismic-induced irregularity significantly increases with the increase in PGA. With a smaller number of spans, the seismic-induced geometric irregularity of rail alignment can be considered to be composed of two approximately symmetric rail deformation sections. With a larger number of spans, it can be considered to be composed of a rail deformation section near the two ends of roadbed and the rail offset section in the middle.
Seismic-Induced Geometric Irregularity of Rail Alignment under Transverse Random Earthquake
As an important lifeline of earthquake relief, railway transportation plays a crucial role in transportation tasks during earthquake relief and post-earthquake reconstruction activities. Determining the representative seismic-induced geometric irregularity of rail alignment is the key to analyzing the safety of train operation after an earthquake. In this study, by taking the high-speed train-CRTS II track-bridge system as the research object, a finite element model was established. From the PEER strong earthquake database, 40 ground motions showing the highest matching degree to the target response spectrum were selected as the ground motion input to establish a sample database of residual rail irregularity after an earthquake. Based on the sample database regarding irregularity, a type of representative seismic-induced geometric irregularity of rail alignment was constructed; the distribution patterns were summarized; and a simplified mathematical model was established, thus providing an irregularity excitation model for analyzing the safety of train operation after an earthquake. According to the research findings, the power spectrum density of the residual rail irregularity after an earthquake at each time-frequency point is subjected to a log-normal distribution. The mean and variance of the power spectrum density set for residual irregularity can be used to generate a definite seismic-induced geometric irregularity of rail alignment. The amplitude of seismic-induced irregularity significantly increases with the increase in PGA. With a smaller number of spans, the seismic-induced geometric irregularity of rail alignment can be considered to be composed of two approximately symmetric rail deformation sections. With a larger number of spans, it can be considered to be composed of a rail deformation section near the two ends of roadbed and the rail offset section in the middle.
Seismic-Induced Geometric Irregularity of Rail Alignment under Transverse Random Earthquake
Yu, Jian (author) / Jiang, Lizhong (author) / Zhou, Wangbao (author) / Liu, Xiang (author) / Lai, Zhipeng (author)
Journal of Earthquake Engineering ; 27 ; 575-596
2023-02-17
22 pages
Article (Journal)
Electronic Resource
Unknown
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