某风机钢筋混凝土基础破坏实例及有限元分析

介绍某风电场1．5MW风电机组钢筋混凝土重力式扩展基础的破坏实例。应用有限元方法分析在各种工况下基础的应力及变形。根据计算结果，分析风机塔筒预埋筒环法兰盘上侧混凝土破坏的原因。破坏调查、检测及计算分析表明，在极端荷载作用下，筒环与混凝土之间的黏结力丧失，导致筒环法兰盘上侧的混凝土受到较大的应力作用，使混凝土发生剪切和疲劳破坏，简环与混凝土基础之间发生明显的滑动位移，塔筒的振动加大，最终引起风机报警停机。在调查与分析结果的基础上，对基础加固处理及混凝土重力式扩展基础的设计提出建议。

Case Study on Reinforced Concrete Foundation Damage of Wind Turbine Generator Tower with Finite Element Method

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 sbow that the bond between the embedded eircular 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 fnundatinn become more and more obvious, which rcsults 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.