关键词: 风电机组, 钢筋混凝土基础, 预埋筒环, 疲劳, 有限元分析

Abstract: A failure case is introduced of an reinforced concrete(RC) gravity spread slab foundation for a 1.5 MW wind turbine generator tower. Under multiple load circumstances, the stress and deformation of the RC foundation are studied with finite element method (FEM) and the damage causes of the RC foundations are discussed. Investigation, testing and FEM analysis show that the bond between the embedded circular steel tube and the concrete foundation is lost when the tower is exposed to extreme loads, which leads to excessive stress in the concrete over flange plate and the shear and fatigue damage of the concrete. Under repeat loads, the damage develops and the slip between the circular steel tube and the concrete foundation become more and more obvious, which results in remarkable vibration of generator tower and even close down of the turbine generator. Based on the analysis, suggestions are made for strengthening treatment and design of the RC gravity spread slab foundations.

Key words: wind turbine generator, reinforced concrete (RC) foundation, embedded circular tube, fatigue, finite element method (FEM)