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Date of Publication:2022-10-09

Journal:可再生能源

Volume:35

Issue:10

Page Number:1558-1565

ISSN No.:1671-5292

Abstract:The seismic stability of the grouted connections of offshore wind turbines is directly related to the safety of offshore wind turbines. To evaluate the seismic performance of grouted connections of offshore wind turbines,numerical models of a 5 MW monopile offshore wind turbine and the grouted connection were established using the OpenSees and ANSYS software packages, respectively. Design ground motions of the severest condition were used as input ground motions. The combinations of wind and wave loads were taken into account to analyze the internal loads and responses of the grouted connection. The results showed that earthquake ground motion resulted in large loads acting on the grouted connection,which introduced to high tensile stress in the grout layer leading to cracks in the grouting material and subsequently the failure of the grouted connection. In scenarios with less severe ground motions,the loads acting on the grouted connection were significantly influenced by the combination of wind and wave loads. The influence of the combination of wind and wave loads on the loads acting on the grouted connection decreased gradually as the intensity of ground motions increased. It is recommended that in seismic analysis,specific attentions should be paid to the grout layer of offshore wind turbines,and the effects of wind and wave loads should be considered.

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