改进的台风下单桩海上风机易损性分析方法及应用

Improved wind-induced fragility assessment method of offshore wind turbines under typhoon and its application

提出了一种改进的台风作用下单桩海上风机易损性分析方法,该方法包括:进行台风模拟,根据模拟台风确定单桩海上风机处的风浪强度指标;将风浪荷载施加在单桩海上风机上,在考虑荷载随机性的情况下得到风机塔筒和桩基的响应极值概率分布曲线;基于非线性屈曲分析得到风机主要构件的承载力概率分布曲线;结合风机主要构件的屈服和屈曲等承载力概率分布曲线,求得单桩海上风机在屈服或屈曲模式下的破坏概率。同时结合江苏某风电场的风浪特性对某5 MW风机进行了风致易损性分析。分析结果可为提升海上风机抗台风风险能力提供参考。

An improved method for analyzing the damage probability of monopile offshore wind turbines under the action of ty-phoons is presented.The method contains four steps.Firstly,the typhoon wind hazard is estimated,and the wind and wave intensi-ty at the monopile offshore fan is determined according to the simulated hurricanes.Secondly,the wind and wave loads are applied to the monopile wind turbine,and the probability distribution curves of the extreme responses for the tower and pile foundation are obtained.Thirdly,the probability distribution curve of bearing capacity is obtained based on nonlinear buckling analysis.Finally,the failure probability of structure under the yield or bucking mode is obtained by combining with the yield fragility curves or buck-ling fragility curves.At the same time,this paper analyzes the vulnerability of NREL 5 MW wind turbine based on the wind and wave characteristics of a wind farm in Jiangsu.The analysis results can be used by engineers to improve the anti-typhoon perfor-mance of the wind turbine.