Research ArticleNo Access

Train–Bridge Coupled Vibration of a Long-Span Steel Truss Suspension Bridge Under Complex Driving Conditions

Chuyi Xu

School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China

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Hao Luo

School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China

E-mail Address: luohao198303@163.com

Corresponding author.

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Xianbei Gan

School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China

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Mougang Liu

School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China

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, and

Hui Guo

Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, P. R. China

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https://doi.org/10.1142/S0219455425500063Cited by:0 (Source: Crossref)

Abstract

To investigate the vibration characteristics of long-span suspension bridges under the impact of high-speed trains, a method for conducting a time–frequency domain analysis of the dynamic response of a coupled system is presented in this study. First, the finite element model of a suspension bridge is established to conduct modal analysis, and simulation results are compared with measured data to validate the correctness of the bridge model. Subsequently, a multi-body dynamics model of a high-speed train is developed. Then, two approaches, the dummy method and flexible-track method, are employed to create the train–bridge coupled system. Finally, the flexible-track method is used to perform time–frequency domain analysis of the system under complex operational conditions. The research revealed that large-span suspension bridges exhibit lower natural frequencies. The vertical bending vibrations of the main beam have the potential to significantly impact train operations. Under the combined impact of cable tension and wheel–rail forces, the vibration patterns of large-span suspension bridges become notably intricate. The number of trains and their loading configurations both exert influence over the dominant frequencies and amplitudes in the PSD of bridges. In the complex traffic of large-span suspension bridges, the rational arrangement of travel lanes can reduce the possibility of resonance in the bridge–train system.

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