Volume 22 Issue 6
Dec.  2022
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GOU Hong-ye, PENG Ye, LI Liang, WANG Jun-ming, PU Qian-hui. Running safety of hybrid rigid frame railway bridge with double-deck combined steel truss during earthquakes[J]. Journal of Traffic and Transportation Engineering, 2022, 22(6): 193-206. doi: 10.19818/j.cnki.1671-1637.2022.06.013
Citation: GOU Hong-ye, PENG Ye, LI Liang, WANG Jun-ming, PU Qian-hui. Running safety of hybrid rigid frame railway bridge with double-deck combined steel truss during earthquakes[J]. Journal of Traffic and Transportation Engineering, 2022, 22(6): 193-206. doi: 10.19818/j.cnki.1671-1637.2022.06.013
shu

Running safety of hybrid rigid frame railway bridge with double-deck combined steel truss during earthquakes

doi: 10.19818/j.cnki.1671-1637.2022.06.013
  • 1.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    Key Laboratory of High-Speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 3.

    China Railway Zhengzhou Bureau Group Co., Ltd., Zhengzhou 450015, Henan, China

Funds:

National Natural Science Foundation of China 52172374

Sichuan Science and Technology Project 2022JDJQ0016

Sichuan Science and Technology Project 2021YJ0054

More Information
  • Author Bio:

    GOU Hong-ye(1983-), female, professor, PhD, gouhongye@swjtu.edu.cn

  • Received Date: 2022-04-19
    Available Online: 2023-01-10
  • Publish Date: 2022-12-25
    Abstract
  • A hybrid rigid frame railway bridge with a double-deck combined steel truss was taken as the engineering background to investigate the running safety of long-span bridges during earthquakes in special areas. A train-track-bridge coupled vibration analysis model was established by taking into account material nonlinearity, tangential friction, and accurate wheel-rail Hertzian contact relationship. In addition, the application of random irregularities of the rails was realized on the basis of the secondary development of ABAQUS-Python software. The EL Centro seismic wave was selected as the input excitation to analyze the damage evolution laws of the hybrid rigid frame bridge with a double-deck combined steel truss under the action of a strong earthquake. The dynamic response indexes under different earthquake intensities and different train speeds were calculated, including the train derailment coefficient, wheel load reduction rate, and train body vibration acceleration. The influence laws of key parameters on the running safety of the bridge during earthquakes were revealed, and the train speed limit based on the running safety was proposed for the hybrid rigid frame bridge. Research results show that the plastic damage in different degrees occurs on each component of the bridge under a rare earthquake (0.38g), the bridge piers are damaged in large areas, and the bridge still has a certain bearing capacity after the earthquake. The train derailment coefficient during the earthquake rises significantly with the increase in the earthquake intensity. The maximum train body vibration acceleration presents an approximately linear increase with the earthquake intensity. The wheel load reduction rate of a train is the key control indicator to the running safety, and its peak value is positively correlated with the train speed. The wheel load reduction rate of a train exceeds the limit, and wheel-rail separation occurs for a long time at the moment when the train gets off the bridge under the train speed of 200 km·h-1 and the earthquake intensity greater than 0.10g. The safe speed is 160 km·h-1 under 0.20g design earthquake from the perspective of running safety. 2 tabs, 13 figs, 30 refs.

     

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