提出一种新型分片式钢管混凝土风电塔。首先,依据相同位置横截面承载力不小于圆锥型塔筒的原则,拟定分片式风电塔结构基本设计参数,然后基于ABAQUS对比研究分片式风电塔与圆锥型塔筒力学性能的差异。研究结果表明：1）与圆锥型塔筒相比,在相同设计载荷下分片式风电塔最大Mises应力减小19.58%,塔顶位移减小24.93%,基频提升11.7%,线性屈曲载荷提升33.0%,非线性屈曲载荷提升41.5%,用钢量减少4%。2）缺陷幅值系数为0.05时,分片式风电塔失稳载荷约为圆锥型塔筒的两倍。3）分片式风电塔不会突然失稳,失稳载荷受缺陷影响小,结构缺陷不敏感,截面塑性区因受钢管混凝土柱的约束扩展受限,其具有良好的屈曲性能和结构延性特征。
Abstract
A new split concrete-filled steel tubular wind turbine tower was proposed. Firstly, based on the principle that the cross-sectional load capacity at the same position was not less than that of the conical tower, the basic design parameters of the split wind turbine tower structure was proposed. Subsequently, a comparative study of the mechanical performance differences between the split wind turbine tower and the conical tower was conducted based on ABAQUS. The research findings indicate that： 1） Compared to the conical tower, under the same design load, the split wind turbine tower exhibits a decrease of 19.58% in maximum Mises stress, a decrease of 24.93% in tower top displacement, an increase of 11.7% in fundamental frequency, a 33.0% increase in linear buckling load, a 41.5% increase in nonlinear buckling load, and a 4.7% decrease in steel consumption. 2） When the imperfect amplitude coefficient is 0.05, the instability load of the split wind turbine tower is approximately twice that of the conical tower. 3） The split wind turbine tower exhibits a gradual stability decline instead of sudden instability and destruction. This design effectively mitigates the instability issue arising from an increasing ratio of diameter to thickness compared to the conical tower. In contrast to the conical tower, its structural load capacity is less affected by imperfection amplitude, rendering it insensitive to imperfection. Moreover, the plasticity zone of the section is restricted due to the constraint imposed by the concrete-filled steel tubular, resulting in excellent buckling performance and structural ductility characteristic.
关键词
风力机塔筒 /
钢管混凝土 /
静力分析 /
模态分析 /
屈曲 /
缺陷不敏感
Key words
wind turbine tower /
concrete-filled steel tubular /
static analysis /
modal analysis /
buckling /
imperfection insensitivity
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