| Summary: | [Introduction] The design waves of Nanhui, Donghai and Dafeng offshore wind farms in China are all in medium water depth and very close to the breaking limit of waves, it is necessary to explore the dynamic response of monopile type offshore wind turbine foundation under breaking wave load in shallow water. [Method] In this paper, FAST full-coupling analysis software was used to calculate the hydrodynamic load by considering the method of wave stretching, the coupling dynamic response characteristics of a monopile type OWT in the East China sea were analyzed. [Result] The analysis results show that the method of wave stretching is effective in calculating the breaking wave load, which is closer to the actual breaking force of the wind turbine. The first order natural frequency of the monopile is more easily excited by the breaking wave, and the dynamic response of the structure is more remarkable under the combined action of wind and waves. [Conclusion] The research results provide a certain reference for the development of monopile type offshore wind power in shallow water nonlinear wave region in China.
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