单桩式海上风机法兰螺栓连接失效行为  

Failure Behavior of Monopile Offshore Wind Turbine Flange Bolted Joints

作　　者：刘本玉 郭建勋 李艳辰 吴欣炎 刘福顺[1] LIU Benyu;GUO Jianxun;LI Yanchen;WU Xinyan;LIU Fushun(College of Engineering,Ocean University of China,Qingdao 266000,Shandong,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266000

出　　处：《中国海洋平台》2025年第1期1-8,15,共9页China offshore Platform

基　　金：国家杰出青年科学基金(编号:52125106);国家自然科学基金(编号:U22A20243)。

摘　　要：针对风机法兰连接处高强螺栓失效影响结构安全运行的问题,以我国江苏如东某风电场4 MW单桩式风机为原型,建立含有螺纹结构的局部法兰模型和考虑法兰连接结构的整体风机模型。开展局部法兰结构在偏心载荷下的摩擦耗散能变化规律以及极限状态下的失效行为研究。通过整体风机模型探讨不同位置处螺栓松动数量、比例与结构承载力之间的关系。结果表明:局部法兰螺栓结构的敏感松动位置位于近加载端的第一圈接触螺纹,极限破坏形式为螺母与螺杆未旋合部位发生断裂破坏;对于整体法兰模型,法兰分离量随受拉侧螺栓松动数量增加呈现先增加后趋于平缓的趋势,法兰分离量对于受拉侧螺栓的初始松动较为敏感。To solve the problem that the failure of high-strength bolts at the flange connection of wind turbines affects the safe operation of the structure,the local flange model with threaded structure and the integral wind turbine model considering the flange connection structure are established,taken the 4 MW monopile wind turbine of a wind farm in Rudong,Jiangsu Province,China,as a prototype.The investigations are conducted on the varying pattern of the frictional dissipation energy of the local flange structure under eccentric load and the failure behaviour under extreme conditions.The relationship between the number and proportion of the bolts loosening at different locations with the structural load carrying capacity is explored through the overall wind turbine model.The results indicate that:the critical loosening point of the local flange bolt structure is situated in the initial contact thread near the loading end,and the ultimate failure mode is the fracture of the unscrewed portion of the nut and screw;for the integral flange model,the flange separation displacement exhibits a tendency to increase first and then level off with the number of bolts loosened on the tension side,which is more sensitive to the initial loosening of the bolts on the tension side.

关 键 词：单桩式海上风机 法兰螺栓连接 失效行为 摩擦耗散能 精细化模型 

分 类 号：TM614[电气工程—电力系统及自动化] TK83[动力工程及工程热物理—流体机械及工程]