由于锚固区域基础刚度的影响,风力发电塔基础预应力锚栓组件受力不同于塔筒钢管间锻造法兰连接系统。基于Petersen计算方法的原理,推导出适用于预应力锚栓式风力机基础的计算方法,建立包含锚栓组件在内的单区隔和整体有限元模型研究基础约束刚度的空间效应。通过对单区隔和整体有限元计算所得锚栓拉力的对比发现,基础约束刚度的空间效应可忽略不计;通过对整体有限元模型计算结果和工程算法计算结果的对比,验证了工程算法的精度。
Abstract
The mechanical performance of prestressed anchor bolts in wind turbine foundations is different from that of the forged flanges between tower tubes because of the influence of the foundation stiffness of the anchorage zone. In this study, an engineering calculation method for prestressed anchor bolts in wind turbine foundations is derived using Petersen method. Finite element models with both single and all anchor bolts are developed to investigate the spatial effect of foundation constraint stiffness. By comparing the tension forces of anchor bolts in the two numerical models, it is concluded that the spatial effect of foundation constraint stiffness can be disregarded. The accuracy of the engineering calculation method is validated by comparison with the numerical results of the finite element model with all anchor bolts.
关键词
风电机组 /
法兰 /
工程计算 /
预应力锚栓 /
有限元模拟
Key words
wind turbines /
flanges /
engineering computing /
prestressed anchor bolt /
finite element simulation
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