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<p>This study investigates the running safety of a decelerating train on bridges subjected to near-fault pulse-like ground motions, with particular attention to the effects of pulse parameters and traveling wave velocity through synthetic seismic excitations. The analysis focuses on the dynamic interaction between the train and bridge, emphasizing the influence of pulse period, amplitude, and wave propagation velocity on both running safety and structural responses. The results indicate that larger pulse amplitudes significantly aggravate dynamic response of both the train and bridge, especially in the lateral direction, thereby increasing derailment risk. Pulse periods of 1–3&#xa0;s tend to induce stronger responses amplitudes due to resonance effects, whereas longer periods mitigate the response amplitudes and enhance system stability. Traveling wave velocities exceeding 900&#xa0;m/s produce nearly uniform seismic excitation, simplifying safety evaluations since further increases in velocity exert negligible impact on system dynamics. Moreover, the Velocity-Related Spectral Intensity (VSI) index exhibits greater sensitivity to deceleration-induced running safety than the conventional Spectral Intensity (SI) index, confirming its effectiveness as a seismic safety metric. These findings provide valuable insights into the seismic performance of train-bridge systems and offer practical guidance for improving the safety assessment and seismic design of railway infrastructures in earthquake-prone regions.</p>

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Seismic deceleration running safety analysis of train-track-bridge system under multi-effects of near-fault pulse-like ground motions and traveling wave effects using the velocity-related spectral intensity index

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Hongkai Ma,
  • Han Zhao,
  • Manman Chen,
  • Xiaonan Xie,
  • Yung William Sasy Chan,
  • Wangbao Zhou,
  • Biao Wei,
  • Delei Yang,
  • Ping Xiang

摘要

This study investigates the running safety of a decelerating train on bridges subjected to near-fault pulse-like ground motions, with particular attention to the effects of pulse parameters and traveling wave velocity through synthetic seismic excitations. The analysis focuses on the dynamic interaction between the train and bridge, emphasizing the influence of pulse period, amplitude, and wave propagation velocity on both running safety and structural responses. The results indicate that larger pulse amplitudes significantly aggravate dynamic response of both the train and bridge, especially in the lateral direction, thereby increasing derailment risk. Pulse periods of 1–3 s tend to induce stronger responses amplitudes due to resonance effects, whereas longer periods mitigate the response amplitudes and enhance system stability. Traveling wave velocities exceeding 900 m/s produce nearly uniform seismic excitation, simplifying safety evaluations since further increases in velocity exert negligible impact on system dynamics. Moreover, the Velocity-Related Spectral Intensity (VSI) index exhibits greater sensitivity to deceleration-induced running safety than the conventional Spectral Intensity (SI) index, confirming its effectiveness as a seismic safety metric. These findings provide valuable insights into the seismic performance of train-bridge systems and offer practical guidance for improving the safety assessment and seismic design of railway infrastructures in earthquake-prone regions.