- 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: | LI Xinran, CHUN Qing, YUAN Yu. Study on flood resistance performance and measures of traditional timber corridor bridges with cantilevered beams[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250144
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To investigate the flood resistance performance of traditional timber corridor bridges with cantilevered beams and the effectiveness of flood resistance measures, a quantitative analysis of flood loads and flood resistance performance was conducted under various flood conditions and flood resistance measures. First, flood loads on the superstructure of the corridor bridge were obtained using computational fluid dynamics (CFD) simulations, and the effects of water levels, flow velocities, and weatherboard removal were investigated. Next, the distribution of flood loads on main components was analyzed at the moment of maximum resistance of the superstructure. Finally, the flood resistance performance of the corridor bridge was assessed by calculating the sliding and overturning risks of the superstructure, and the enhancement effects of weatherboard removal and deck weighting on flood resistance performance were quantitatively evaluated. The results show that the drag force on the superstructure increases by 145.38% and 95.71% with the increase of water levels and flow velocities, respectively. In the presence of weatherboards, the drag force is primarily distributed on the upstream weatherboard and the cantilever beams along the longitudinal axis of the bridge. After removing weatherboards, the drag force is mainly distributed on the cantilever beams along the longitudinal axis and the main beams. Under baseline flood conditions, the maximum drag force on the superstructure decreases by 17.79%; the reduction reaches 48.08% under high water level conditions; while an increase of 1.51% is observed under high flow velocity conditions. As the water level rises, the lift force acting on the superstructure increases rapidly and then stabilizes. Removing weatherboards can reduce the maximum lift force but leads to an earlier occurrence of the peak lift. The corridor bridge faces sliding failure risks under both high flow velocity and high water level conditions. When the uniformly distributed load added to the bridge deck reaches 4.0 kN/m2, the stability of the corridor bridge under the most unfavorable conditions can be ensured. If weatherboards are simultaneously removed, the required uniformly distributed load on the bridge deck can be reduced to 0.5 kN/m2 and 2.5 kN/m2 under high flow velocity and high water level conditions, respectively.
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