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Experimental study and numerical simulation on the bearing behavior of the modified suction caisson under misalignment lateral cyclic and monotonic loadings

Suction caissons for offshore wind turbines are subjected to lateral misalignment wind and wave loads during service life, leading to the occurrence of accumulate deflection and changes in lateral bearing capacity. Experimental studies and numerical simulations were performed to investigate the moti...

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Bibliographic Details
Published in:Ocean engineering 2025-01, Vol.316, Article 119922
Main Authors: Zhang, Yukun, Yang, Bohao, Xiang, Qian, Li, Dayong, Feng, Lingyun
Format: Article
Language:English
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Summary:Suction caissons for offshore wind turbines are subjected to lateral misalignment wind and wave loads during service life, leading to the occurrence of accumulate deflection and changes in lateral bearing capacity. Experimental studies and numerical simulations were performed to investigate the motion mode, accumulated lateral deflection, and bearing capacity of a modified suction caisson (MSC) under misalignment lateral cyclic and monotonic loadings. Under misalignment lateral cyclic and monotonic loadings, the motion behavior of the MSC is combined with the translation, rotation, and torsion. The direction of MSC motion lies between cyclic and monotonic loading directions. The angle between the motion direction and cyclic loading direction is far less than that between the motion direction and monotonic loading direction. Under the same cyclic and monotonic load values, the maximum accumulated deflection was obtained when the angle between lateral cyclic and monotonic loading directions (which is defined as the misalignment angle) equals 30°. In addition, the lateral bearing capacity of the MSC after misalignment cyclic and monotonic loading was found to decrease with increasing the misalignment angle. The minimum lateral bearing capacity of the MSC after misalignment loading was obtained when the misalignment angle equals 180°. Based on the model test and simulation results, the method applying the model test results to the practical engineering is proposed. •Bearing behavior of MSC under misalignment lateral cyclic and monotonic loadings were investigated.•The maximum accumulated deflection was obtained when the misalignment angle equals 30°.•The minimum lateral bearing capacity was obtained when the misalignment angle equals 180°.•Ignoring the misalignment loading effect will make the suction caisson design potentially hazardous.•Method applying the model test results to the practical engineering is proposed.
ISSN:0029-8018
DOI:10.1016/j.oceaneng.2024.119922