导管架基础过渡段是连接上部塔筒和下部导管架主体结构、确保上部风机载荷有效传递到下部导管架主体结构上的关键结构,具有承上启下的作用,是整个导管架基础设计的重点和难点.以相同海域大、小兆瓦级海上风机为研究对象,采用大型通用有限元软件ANSYS建立基准模型进行分析,提炼出结构频率随结构型式的变化规律.基于不同兆瓦级风机过渡段结构,分别进行强度及屈曲稳定性能分析;同时,结合等效静力荷载方法选用适用于该结构型式的疲劳曲线,计算不同工况下不同兆瓦级风机导管架基础过渡段结构的累积疲劳损伤.在此基础上,对新型大兆瓦级过渡段结构进行疲劳敏感性分析,对不同型式的过渡段结构进行对比计算,最终确定可用于大兆瓦级海上风机导管架基础的新型过渡段结构.
The transition section of a jacket foundation is a critical structure that connects the upper tower and the lower jacket foundation.It ensures that the upper loads are effectively transferred to the lower jacket foundation,serving as a link between the upper and lower structures.The design of this section is the focus and difficulty of the entire jacket foundation design.This paper takes offshore wind turbines of different megawatt in the same sea area as the research object,uses the finite element analysis software ANSYS to establish models for analysis,and obtains the relationships between structural frequency and structural types.The strength and buck-ling stability are analyzed.Additionally,the fatigue curve suitable for each transition section type is selected based on the equivalent static load method to calculate the cumulative fatigue damage under different working conditions.Based on this analysis,the fatigue sensitivity analysis of a new transition section is carried out,and the different types of the transition sections are calculated and compared.Finally,the new transition section which can be used for the jacket foundation of large-megawatt offshore wind turbines is determined.