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<p>This study focuses on evaluating the effects of tuned mass damper (TMD) is installed on bridges on the vibration characteristics of the bridges and the driving safety of the trains under the debris flow impact (DFI). Firstly, a refined model of DFI on bridge pier is established using the smoothed particle hydrodynamics theory (SPH), and the dynamic evolution process of DFI on pier is simulated. Secondly, based on the train-track-bridge dynamics theory and the TMD design method, a train-track-bridge-TMD system coupled model considering the DFI is constructed. The influences of TMD on the dynamic behavior of the bridges and trains under the DFI is investigated. Furthermore, the running performance of the trains under the action of TMD is evaluated. Results show that the more severe vibrations of the bridges near the lateral natural frequency could be excited by the DFI, which should be suppressed. The vibration responses of the bridges and the trains are obviously reduced under the action of TMD. And with the increase of the trains speed, TMD still has the superior vibration reduction effects on the dynamic responses of the trains. After installing TMD on the bridge, both the derailment coefficient and wheel unloading rate of the trains are effectively decreased under the extreme debris flow impact, improving the driving safety of the trains.</p>

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Study on the railway bridge vibration reduction characteristic and train driving safety evaluation under debris flow impact

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Penghao Li,
  • Zhenxing He

摘要

This study focuses on evaluating the effects of tuned mass damper (TMD) is installed on bridges on the vibration characteristics of the bridges and the driving safety of the trains under the debris flow impact (DFI). Firstly, a refined model of DFI on bridge pier is established using the smoothed particle hydrodynamics theory (SPH), and the dynamic evolution process of DFI on pier is simulated. Secondly, based on the train-track-bridge dynamics theory and the TMD design method, a train-track-bridge-TMD system coupled model considering the DFI is constructed. The influences of TMD on the dynamic behavior of the bridges and trains under the DFI is investigated. Furthermore, the running performance of the trains under the action of TMD is evaluated. Results show that the more severe vibrations of the bridges near the lateral natural frequency could be excited by the DFI, which should be suppressed. The vibration responses of the bridges and the trains are obviously reduced under the action of TMD. And with the increase of the trains speed, TMD still has the superior vibration reduction effects on the dynamic responses of the trains. After installing TMD on the bridge, both the derailment coefficient and wheel unloading rate of the trains are effectively decreased under the extreme debris flow impact, improving the driving safety of the trains.