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<p>The connection between the jack-up leg and the spudcan is a significant structural component of jack-up vessels and plays a decisive role in their operational safety and service life. Fatigue is one of the key deterioration processes in structural operation due to cyclic loading caused by environmental processes, wave-induced structure motion, and operational loads. Thus, fatigue life assessment is critical to the structural failure assessment in offshore applications. This study represents a fatigue life assessment of the leg–spudcan structures using finite element analysis (FEA) and the hot spot stress methodology. A parameterized numerical model is constructed to extract stress distributions and derive the fatigue damage ratio per the classification society. Realistic operational scenarios are expressed based on several loading conditions and the probabilities of wave direction. These results exemplify that the system was designed with an adequate fatigue safety margin for the 20-year service life requirement. Moreover, stress concentration factors, weld geometry, and the probability of load direction are addressed regarding their influence on fatigue performance. Sensitivity simulation was performed to evaluate the effect of initiating material properties, plate thickness alterations, and various S–N curves on predicted fatigue lives. It will furnish significant information on the jack-up structure response and assist in optimizing the leg–spudcan interface, which can help improve reliability and extend the operational envelope of jack-ups in offshore locations. The result has future considerations in experimental validation and corrosion influences on long fatigue lifetime performance.</p>

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Local fatigue assessment of welded joints between leg and spudcan structures connection in jack-up wind turbine installation vessel

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Van Vu Huynh,
  • Huy Vu Nguyen,
  • Thanh Nhut Pham,
  • Quang Thang Do

摘要

The connection between the jack-up leg and the spudcan is a significant structural component of jack-up vessels and plays a decisive role in their operational safety and service life. Fatigue is one of the key deterioration processes in structural operation due to cyclic loading caused by environmental processes, wave-induced structure motion, and operational loads. Thus, fatigue life assessment is critical to the structural failure assessment in offshore applications. This study represents a fatigue life assessment of the leg–spudcan structures using finite element analysis (FEA) and the hot spot stress methodology. A parameterized numerical model is constructed to extract stress distributions and derive the fatigue damage ratio per the classification society. Realistic operational scenarios are expressed based on several loading conditions and the probabilities of wave direction. These results exemplify that the system was designed with an adequate fatigue safety margin for the 20-year service life requirement. Moreover, stress concentration factors, weld geometry, and the probability of load direction are addressed regarding their influence on fatigue performance. Sensitivity simulation was performed to evaluate the effect of initiating material properties, plate thickness alterations, and various S–N curves on predicted fatigue lives. It will furnish significant information on the jack-up structure response and assist in optimizing the leg–spudcan interface, which can help improve reliability and extend the operational envelope of jack-ups in offshore locations. The result has future considerations in experimental validation and corrosion influences on long fatigue lifetime performance.