Volume 26 Issue 6
Jun.  2026
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LIU Hong-xi, LIU Yu-qing, CHANG Zhi-jun, CHEN Hu-cheng, XU Xiao-qing. Fatigue performance of hot-rolled thickened U rib-to-deck double-sided welds based on structural stress method[J]. Journal of Traffic and Transportation Engineering, 2026, 26(6): 63-71. doi: 10.19818/j.cnki.1671-1637.2026.234
Citation: LIU Hong-xi, LIU Yu-qing, CHANG Zhi-jun, CHEN Hu-cheng, XU Xiao-qing. Fatigue performance of hot-rolled thickened U rib-to-deck double-sided welds based on structural stress method[J]. Journal of Traffic and Transportation Engineering, 2026, 26(6): 63-71. doi: 10.19818/j.cnki.1671-1637.2026.234
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Fatigue performance of hot-rolled thickened U rib-to-deck double-sided welds based on structural stress method

doi: 10.19818/j.cnki.1671-1637.2026.234
  • 1.

    Department of Bridge Engineering, Tongji University, Shanghai 200092, China

  • 2.

    CCCC Highway Consultant Co., Ltd., Beijing 100088, China

Funds:

National Natural Science Foundation of China 52378181

More Information
  • Corresponding author: XU Xiao-qing, assistant professor, PhD, Email: 21030@tongji.edu.cn
  • Received Date: 2025-10-23
  • Accepted Date: 2026-03-20
  • Rev Recd Date: 2025-12-28
  • Publish Date: 2026-06-28
    Abstract
  • Finite element analysis was conducted on orthotropic steel deck models incorporating U ribs of different dimensions to elucidate the fatigue performance of hot-rolled thickened U rib-to-deck double-sided weld details and investigate the influence of increased thickness at U rib limb ends on weld fatigue strength. Based on the structural stress method, the influence of U rib dimensions on the fatigue performance of U rib-to-deck welds was investigated. Furthermore, the fatigue life of the constant thickness U rib and hot-rolled thickened U rib-to-deck weld details was analyzed according to the master S-N curve. The results indicate that the equivalent structural stress at the inner weld of the U rib-to-deck joint is significantly higher than that at the outer weld, thus making the inner weld toe more prone to fatigue crack initiation. The adoption of 8-12 mm hot-rolled thickened U ribs effectively reduces the equivalent structural stress at the inner weld of the U rib-deck joint by 12.9%. Based on the master S-N curve with a 95% confidence interval, compared to constant thickness 8 mm U ribs, the fatigue life of the inner side weld details by employing 8-12 mm and 12-16 mm hot-rolled thickened U ribs increases by 54.2% and 174.8% respectively. Hot-rolled thickened U ribs improve the fatigue performance of U rib-to-deck weld details by locally increasing the thickness at the limb ends. The combination of thickened limb-end configurations and double-sided welds provides a viable approach for improving the fatigue performance of orthotropic steel decks.

     

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