Research PaperNo Access

A Code-Type Method to Assess the Running Safety of Railway Vehicles on Bridges Shaken by Earthquakes Including Girder’s Torsional Motion

Zhibin Jin

Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, P. R. China

E-mail Address: jinzhibin@swjtu.cn

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Weizhan Liu

Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, P. R. China

E-mail Address: wzliu@my.swjtu.edu.cn

Corresponding author.

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, and

Shiling Pei

Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, USA

E-mail Address: spei@mines.edu

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https://doi.org/10.1142/S0219455423500013Cited by:4 (Source: Crossref)

Abstract

The safety of railway vehicles running on bridges needs to be evaluated in the seismic design of bridges. This study examined the spectral intensity calculated from the lateral vibration of the bridge deck during earthquakes, a Japanese code-based index to measure bridge vibration’s strength. In addition, the effect of the torsion of the bridge deck on vehicle derailment is investigated using a nonlinear vehicle–track–bridge model. The bridge deck torsion increases the derailment risk, especially for bridges with a low natural frequency. The reason lies in that the lateral and torsional deck motions are highly correlated for bridges with lower frequency. Based on this observation, a code-type formula was proposed to evaluate the vehicle running safety including both lateral and torsional motions of the bridge deck. The accuracy of the proposed formula was demonstrated by comparison with vehicle–track–bridge simulation excited by ground motion records. The new procedure overcomes the non-conservative assessment of derailment caused by ignoring bridge torsion.

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