A study on vibration suppression of a bridge in Sichuan—Tibet Railway and running safety of a train under floating ice collision

LI Penghao1,ZHAI Wanming2,HE Zhenxing1,SHI Guangtian1

Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (8) : 79-85.

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (8) : 79-85.

A study on vibration suppression of a bridge in Sichuan—Tibet Railway and running safety of a train under floating ice collision

  • LI Penghao1,ZHAI Wanming2,HE Zhenxing1,SHI Guangtian1
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Abstract

The impact of floating ice is a common natural disaster of bridges in the complex and difficult mountainous areas of the Sichuan-Tibet Railway. To evaluate the effect of dynamic vibration absorbers (DVA) on vibration suppression characteristics of bridge and the running of trains on the bridge under impact loads. Based on the train-track-bridge dynamic interaction and the design method of DVA, the dynamics model of train-track-bridge-DVA considering the effects of floating ice impact loads is established. The vibration suppression of the bridge subject to the ice impact loads by DVA is investigated and the influence on the running of train on the bridge is analyzed. Results show that with the addition of DVA to the top of the bridge pier, the lateral vibration of the bridge structure under the ice impact loads can be effectively suppressed, and the dynamic indexes such as lateral acceleration of train, lateral wheel-rail force, derailment factor and wheel unloading rate are significantly reduced when the train crosses the bridge. When the speed increases to 200km/h, DVA still has a good damping effect on the dynamic response of the train. And the damping effect of train dynamic responses all increases with the increase of the mass ratio of DVA, while the running speed remains unchanged. It shows that the installation of DVA on the bridge is all beneficial to the resistance to ice impact of the railway bridge and the running of trains on the bridge.

Key words

railway bridge / floating ice collision / train-track-bridge dynamic interaction / dynamic vibration absorbers / vibration suppression

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LI Penghao1,ZHAI Wanming2,HE Zhenxing1,SHI Guangtian1. A study on vibration suppression of a bridge in Sichuan—Tibet Railway and running safety of a train under floating ice collision[J]. Journal of Vibration and Shock, 2022, 41(8): 79-85

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