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为了研究冲刷作用对采用大直径单桩的海上风电结构的第一阶自振频率的影响规律,本文采用有限元方法建立桩一土相互作用的风电结构模型,进行模态分析。分析了冲刷深度、冲刷坑宽度、冲刷坑坡角及土体的性质变化等因素对风电结构第一阶自振频率的影响规律。结果表明:冲刷深度的变化对风电结构的第一阶自振频率影响很大,冲刷深径比越大,风电结构第一阶自振频率越小;冲刷引起的土体性质衰退会导致风电结构的第一阶自振频率的明显下降;而冲刷宽度和冲刷坡角的影响则相对较小。本文的分析结果可为海上风电结构的设计提供决策依据,也可为其他类似工程提供借鉴。
In order to study the effect of erosion on the natural frequency of the first order of offshore wind structures with large diameter single pile, a finite element method is used to establish the wind-pile structural model of the pile-soil interaction for modal analysis. The influence law of the first order natural frequency of wind power structure is analyzed, such as the depth of scouring, the width of scouring pit, the angle of scour pit and the nature of soil. The results show that the variation of erosion depth has a great influence on the first natural frequency of wind power structure. The larger the scour depth-depth ratio is, the smaller the first natural frequency of wind power structure is. Of the first order natural frequency significantly decreased; and the impact of erosion width and scour angle is relatively small. The results of this paper can provide decision-making basis for the design of offshore wind power structure and provide reference for other similar projects.