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<p>Jacket-type offshore structures consist of tubular members joined by welding, where the weld geometry plays a crucial role in determining hot-spot stresses and, consequently, the fatigue strength of the joints. The weld geometry can be modeled using the finite element (FE) method; however, FE models usually employ assumed weld geometry. It is of interest to investigate the effect of the modeling options related to the weld geometry on the hot-spot stress. The weld geometry of a T-shaped tubular joint was measured using 3D scanning. Different from conventional industry practices, this approach captures the actual shape of the weld joints and toes. An FE model was generated based on the coordinates of the weld toe points, which can lead to more accurate hot-spot stress predictions. In addition, one FE model without welds and two FE models with assumed weld geometry, based on the specifications of the American Welding Society (AWS), were constructed. The hot-spot stresses of these models were compared, and significant deviations were observed. These findings highlight that model uncertainty in hot-spot stress should be considered in fatigue strength assessment to enhance the reliability of offshore structural designs.</p>

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Hot-Spot Stress Analyses of a T-Shaped Tubular Joint Based on Scanned Weld Geometry

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Jingjing Chen,
  • Yan Dong,
  • Zhihao Ai,
  • Zhuang Kang,
  • Jeom Kee Paik,
  • Wei Qu

摘要

Jacket-type offshore structures consist of tubular members joined by welding, where the weld geometry plays a crucial role in determining hot-spot stresses and, consequently, the fatigue strength of the joints. The weld geometry can be modeled using the finite element (FE) method; however, FE models usually employ assumed weld geometry. It is of interest to investigate the effect of the modeling options related to the weld geometry on the hot-spot stress. The weld geometry of a T-shaped tubular joint was measured using 3D scanning. Different from conventional industry practices, this approach captures the actual shape of the weld joints and toes. An FE model was generated based on the coordinates of the weld toe points, which can lead to more accurate hot-spot stress predictions. In addition, one FE model without welds and two FE models with assumed weld geometry, based on the specifications of the American Welding Society (AWS), were constructed. The hot-spot stresses of these models were compared, and significant deviations were observed. These findings highlight that model uncertainty in hot-spot stress should be considered in fatigue strength assessment to enhance the reliability of offshore structural designs.