陆上风机基础混凝土的可靠度分析

Reliability Analysis of Wind Turbine Foundation Concrete on Land

目的研究风荷载作用下风机基础混凝土的疲劳可靠度,基于栓钉抗剪连接件的作用和优点,对风机基础进行优化设计。方法利用通用有限元软件ABAQUS建立1.5 MW陆地风电机有限元模型,把求得的叶片和塔筒荷载施加于模型上,用于提取风机基础危险部位的应力时程;并结合概率密度演化方法,分析整个基础混凝土的疲劳可靠度。结果风机基础混凝土的疲劳可靠度随着时间的变化而降低,且风机基础环与混凝土之间存在脱空现象;在基础环上设置上下两排栓钉,可以使风机基础混凝土的疲劳可靠度增加,且能够将基础环滞回曲线反力峰值提高4倍。结论在风机基础环上设置上下两排栓钉是陆地风机基础抗疲劳的关键构件,能够有效抵抗疲劳振动荷载作用。

Based on the function and advantages of stud shear connectors,this paper presents the optimal design of wind turbine foundation to study the fatigue reliability of wind turbine foundations concrete under wind load.The finite element model of 1.5 MW Land wind foundation was established by using the general finite element software ABAQUS,the wind loads on the blade and tower were applied to the model to extract the stress history of dangerous parts of wind turbine foundation,according probability density evolution method,the fatigue reliability of the whole foundation concrete was analyzed.With the change of time,the fatigue reliability of wind turbine foundation concrete not only decreases,but also there is void between wind turbine foundation ring and concrete.Setting two rows of studs on the foundation ring not only can improve the fatigue reliability of the fan foundation concrete,but also increase the reaction peak value of the hysteretic curve of the foundation ring by four times,which can effectively resist the fatigue vibration load,for land wind turbine foundation,it is the key component to resist fatigue.