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This study presents a comprehensive numerical evaluation of the seismic performance of Concrete-Filled Double-Skin Tubular (CFDST) and Concrete-Filled Tubular (CFT) leg jackets, benchmarked against conventional steel leg jackets. As primary load-bearing elements in offshore wind turbines and oil platforms, jacket structures require robust seismic resilience to ensure structural stability and safety. Finite Element Method (FEM) analyses were conducted using SAP2000 to investigate dynamic characteristics, displacement responses, lateral resistance, and stiffness. The results show that the conventional steel jacket had the longest fundamental period, indicating the lowest stiffness, while CFDST and CFT jackets exhibited shorter and more stable periods across multiple modes. Under seismic loading, the steel jacket experienced the highest displacements, underscoring its limited resistance. Conversely, CFDST and especially CFT jackets demonstrated significantly lower deformation, indicating enhanced seismic capacity. Pushover analysis confirmed that increased concrete infill markedly improves lateral resistance, with the CFT jacket exhibiting the highest load-bearing capacity. Stiffness analysis further revealed that both CFDST and CFT jackets outperformed the steel jacket, with increased concrete volume correlating with improved structural rigidity.

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Seismic Performance of CFDST and CFT Jacket Structures

  • 会议论文

  • 发表日期：

    2026年

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  • Andrey Lipin,
  • Seymur Bashirzade,
  • Mukhlis Hajiyev

摘要

This study presents a comprehensive numerical evaluation of the seismic performance of Concrete-Filled Double-Skin Tubular (CFDST) and Concrete-Filled Tubular (CFT) leg jackets, benchmarked against conventional steel leg jackets. As primary load-bearing elements in offshore wind turbines and oil platforms, jacket structures require robust seismic resilience to ensure structural stability and safety. Finite Element Method (FEM) analyses were conducted using SAP2000 to investigate dynamic characteristics, displacement responses, lateral resistance, and stiffness. The results show that the conventional steel jacket had the longest fundamental period, indicating the lowest stiffness, while CFDST and CFT jackets exhibited shorter and more stable periods across multiple modes. Under seismic loading, the steel jacket experienced the highest displacements, underscoring its limited resistance. Conversely, CFDST and especially CFT jackets demonstrated significantly lower deformation, indicating enhanced seismic capacity. Pushover analysis confirmed that increased concrete infill markedly improves lateral resistance, with the CFT jacket exhibiting the highest load-bearing capacity. Stiffness analysis further revealed that both CFDST and CFT jackets outperformed the steel jacket, with increased concrete volume correlating with improved structural rigidity.