Fatigue Damage of Tied-Arch Bridge Hangers Based on Train-Bridge Coupling

PENG Yipu; TANG Zhiyuan; CHEN Li; LI Jian; LI Zichao

doi:10.3969/j.issn.0258-2724.20230450

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Journal of Southwest Jiaotong University > 2025 > Accepted Manuscript

PENG Yipu, TANG Zhiyuan, CHEN Li, LI Jian, LI Zichao. Fatigue Damage of Tied-Arch Bridge Hangers Based on Train-Bridge Coupling[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230450

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PENG Yipu, TANG Zhiyuan, CHEN Li, LI Jian, LI Zichao. Fatigue Damage of Tied-Arch Bridge Hangers Based on Train-Bridge Coupling[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230450

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Fatigue Damage of Tied-Arch Bridge Hangers Based on Train-Bridge Coupling

doi: 10.3969/j.issn.0258-2724.20230450

School of Civil Engineering, Central South University, Changsha 410075, China

Received Date: 04 Sep 2023
Rev Recd Date: 07 Apr 2024

Available Online: 19 Mar 2025

Abstract

Abstract

To study the fatigue damage inflicted on hangers by high-speed trains passing over a concrete-filled steel-tube tied-arch bridge, field dynamic load tests were conducted against the backdrop of the Qinjiang Bridge in Qinzhou, Guangxi Province. These tests measured the bridge’s modal parameters, displacement, acceleration, and dynamic stress. By using the finite element software ANSYS, a bridge model was established, and its accuracy was verified by comparing measured frequencies and vibration patterns. The bridge model was then integrated with a CRH2 train model developed in the multibody dynamics software SIMPACK to achieve train-bridge coupling and conduct joint simulations. By comparing simulation results under identical conditions with actual measurements, the reliability of the train-bridge coupled vibration system was validated. On this basis, the Palmgren-Miner linear fatigue damage criterion was applied to investigate the impact of different operating speeds and track smoothness on the fatigue damage of the hanger. The results show that the joint simulation is efficient and reliable. Short hangers on the tied-arch bridge are more sensitive to coupled vibrations caused by different speeds and track smoothness than long hangers. For instance, the fatigue damage of the train to hanger 1# at a speed of 190 km/h is 3.5 times that of hanger 7#. With the increase in train speed, the fatigue damage degree of hangers shows a wave-like increasing trend instead of a continuous increase, exhibiting a critical speed near the bridge’s natural frequency. Optimizing or deteriorating the track smoothness of the bridge exponentially affects the fatigue damage of the hanger.
- fatigue damage,
- tied-arch bridge,
- train-bridge coupling,
- dynamic load test,
- railroad bridge

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