海上风电单桩支撑结构第一自振频率分析研究  

A Numerical Study of the First Natural Frequency of Offshore Wind Turbine Monopile Supporting Structure Foundation

作　　者：马宏旺[1] 陈龙珠[1] 刘桦[1] 朱鹏[2] 

机构地区：[1]上海交通大学船舶海洋与建筑工程,学院200240 [2]中国海洋石油总公司,北京100016

出　　处：《特种结构》2014年第1期109-113,共5页Special Structures

基　　金：国家自然科学基金(51078231)

摘　　要：目前,海上风电支撑结构一般设计成半柔性结构,为避开风机叶轮激振频率,风电支撑结构第一自振频率处于1倍和3倍的风轮激振频率之内,所以要求设计时能够准确计算风电支撑结构的第一自振频率,避免由共振而带来严重破坏。但海上风机自振频率受整体结构形式、地质环境条件、土-结构相互作用、水附加质量等影响,采用简单模型很难准确得到。为此,本文针对海上风电单桩结构,基于ABAQUS软件建立了整体有限元模型。土体采用有限元-无限元相结合的方式进行模拟、桩-土之间采用接触单元、考虑水附加质量的影响,计算结构的第一自振频率并进行参数敏感性分析。研究表明采用三维有限模型,考虑土-结构相互作用,能够较准确计算海上风电结构第一自振频率,为风电结构设计提供更可靠的设计参数。To avoid resonance, the offshore wind turbine structure should be designed such that its first natural frequency fall between into lp and 3p, the structure is said to be soft-stiff structure. So it need to calculate the first natural frequency accurately for design offshore wind turbine structures. But there are a few factors such as structural type, soil-structure interaction, attached water mass and geological conditions that affect the first natural frequency, it is difficult to calculate accurately by sample models. Therefore, this paper established the three dimension fnite model which considering soil-structure interaction and attached water masses, soil is simulated by combining infinite element and finite element. The first natural frequency and parameters sensitivity is analyzed by this model. The results show that utilizing the three dimensional finite model, considering soil-structure interaction is more accurate for calculating the first natural frequency, it can provide reliably design parameter for offshore wind turbine structure design.

关 键 词：第一自振频率 海上风电 单桩基础 有限元 无限元 

分 类 号：TM315[电气工程—电机] TU476.1[建筑科学—结构工程]