- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | YANG Wanli, QIN Junwu, HOU Hailin, WU Wenbo, ZHOU Lingyuan. Failure Mechanism of Flood Damage to Jinsha River Bridge at Zhubalong[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 120-128. doi: 10.3969/j.issn.0258-2724.20200732
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To explore the failure mechanism of Jinsha River Bridge at Zhubalong, a 1∶20 scaled numerical simulation model of the bridge was built with the measured field data in flood discharge, while the influence of air trapped in the diaphragm chamber at the bottom of T-beam is analyzed. The characteristics of flood force, flow field and failure mechanism of superstructure of the simply supported T-beam bridge under the effect of flood are studied in depth. Results show that when the submergence ratio is less than 1.342, the horizontal force coefficient increase with the ratio; when it is beyond 1.342, the coefficient decreases with the ratio. Before the backwater crosses the guardrail, the vertical force and overturning moment coefficient gradually increase with the submergence ratio. When it crosses the guardrail, the vertical force and overturning moment coefficient decrease sharply. When the submergence ratio is close to 1.000, the risk of the superstructure failure is the greatest. During the failure process of the bridge, horizontal movements occur first, and then there is a high probability that floating and overturning occur. The beam movement leads to the destruction of the link stopper, and part of the beam overturns in the falling. Solid railings contribute up to 31% of the horizontal force, and the contribution of entrapped air to the vertical force is up to 18%. Solid railings and entrapped air are important causes for flood damage or accelerating the bridge damage.
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