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An engineering method for structural analysis of semisubmersible floating offshore wind turbine substructures

Victor Rappe (UGent) , Kris Hectors (UGent) , Muk Chen Ong and Wim De Waele (UGent)
(2025) JOURNAL OF MARINE SCIENCE AND ENGINEERING. 13(9).
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Abstract
This work proposes a mid-fidelity load-mapping method for the structural analysis of semisubmersible floating offshore wind turbine substructures. Building on a hybrid linear potential flow and strip-theory dynamic analysis, the method maps hydrodynamic, current, hydrostatic, gravitational, inertial, mooring, and turbine loads onto a shell-based finite element (FE) model. The functionality of the proposed method is demonstrated through two case studies involving ultimate limit state analysis of a structurally reinforced OC4 DeepCwind semisubmersible platform. The analyses were conducted for two design load cases (DLCs) formulated to represent the metocean conditions at the Utsira Nord site, located off the coast of Norway. The accuracy of the mapped hydrostatic and potential flow loads is validated against dynamic simulation data, while a mesh convergence study is used to ensure reliable FE model performance. Results show that the highest von Mises stresses occur at unsupported heave-plate regions, internal stiffeners, and welded joints, with peak stresses safely below the steel’s yield strength. The more severe conditions of DLC 6.1 lead to a broader distribution of high-stress locations compared to DLC 1.6 but only a modest increase in peak stress.
Keywords
floating offshore wind turbines, ultimate limit state analysis, finite element analysis, structural analysis

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MLA
Rappe, Victor, et al. “An Engineering Method for Structural Analysis of Semisubmersible Floating Offshore Wind Turbine Substructures.” JOURNAL OF MARINE SCIENCE AND ENGINEERING, edited by Jonas W. Ringsberg et al., vol. 13, no. 9, 2025, doi:10.3390/jmse13091630.
APA
Rappe, V., Hectors, K., Ong, M. C., & De Waele, W. (2025). An engineering method for structural analysis of semisubmersible floating offshore wind turbine substructures. JOURNAL OF MARINE SCIENCE AND ENGINEERING, 13(9). https://doi.org/10.3390/jmse13091630
Chicago author-date
Rappe, Victor, Kris Hectors, Muk Chen Ong, and Wim De Waele. 2025. “An Engineering Method for Structural Analysis of Semisubmersible Floating Offshore Wind Turbine Substructures.” Edited by Jonas W. Ringsberg, Baiqiao Chen, and Bin Liu. JOURNAL OF MARINE SCIENCE AND ENGINEERING 13 (9). https://doi.org/10.3390/jmse13091630.
Chicago author-date (all authors)
Rappe, Victor, Kris Hectors, Muk Chen Ong, and Wim De Waele. 2025. “An Engineering Method for Structural Analysis of Semisubmersible Floating Offshore Wind Turbine Substructures.” Ed by. Jonas W. Ringsberg, Baiqiao Chen, and Bin Liu. JOURNAL OF MARINE SCIENCE AND ENGINEERING 13 (9). doi:10.3390/jmse13091630.
Vancouver
1.
Rappe V, Hectors K, Ong MC, De Waele W. An engineering method for structural analysis of semisubmersible floating offshore wind turbine substructures. Ringsberg JW, Chen B, Liu B, editors. JOURNAL OF MARINE SCIENCE AND ENGINEERING. 2025;13(9).
IEEE
[1]
V. Rappe, K. Hectors, M. C. Ong, and W. De Waele, “An engineering method for structural analysis of semisubmersible floating offshore wind turbine substructures,” JOURNAL OF MARINE SCIENCE AND ENGINEERING, vol. 13, no. 9, 2025.
@article{01K4W0141T82WJ65YAA990K203,
  abstract     = {{This work proposes a mid-fidelity load-mapping method for the structural analysis of semisubmersible floating offshore wind turbine substructures. Building on a hybrid linear potential flow and strip-theory dynamic analysis, the method maps hydrodynamic, current, hydrostatic, gravitational, inertial, mooring, and turbine loads onto a shell-based finite element (FE) model. The functionality of the proposed method is demonstrated through two case studies involving ultimate limit state analysis of a structurally reinforced OC4 DeepCwind semisubmersible platform. The analyses were conducted for two design load cases (DLCs) formulated to represent the metocean conditions at the Utsira Nord site, located off the coast of Norway. The accuracy of the mapped hydrostatic and potential flow loads is validated against dynamic simulation data, while a mesh convergence study is used to ensure reliable FE model performance. Results show that the highest von Mises stresses occur at unsupported heave-plate regions, internal stiffeners, and welded joints, with peak stresses safely below the steel’s yield strength. The more severe conditions of DLC 6.1 lead to a broader distribution of high-stress locations compared to DLC 1.6 but only a modest increase in peak stress.}},
  articleno    = {{1630}},
  author       = {{Rappe, Victor and Hectors, Kris and Ong, Muk Chen and De Waele, Wim}},
  editor       = {{Ringsberg, Jonas W. and Chen, Baiqiao and Liu, Bin}},
  issn         = {{2077-1312}},
  journal      = {{JOURNAL OF MARINE SCIENCE AND ENGINEERING}},
  keywords     = {{floating offshore wind turbines,ultimate limit state analysis,finite element analysis,structural analysis}},
  language     = {{eng}},
  number       = {{9}},
  pages        = {{24}},
  title        = {{An engineering method for structural analysis of semisubmersible floating offshore wind turbine substructures}},
  url          = {{http://doi.org/10.3390/jmse13091630}},
  volume       = {{13}},
  year         = {{2025}},
}
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