采用一种螺旋网格建立塔筒的抗扭承载力分析有限元模型,对网格的收敛性进行分析。基于螺旋网格有限元模型,对塔筒进行线性屈曲分析以及考虑缺陷的几何非线性分析,研究径厚比、无量纲长度与缺陷幅值等因素对扭矩作用下圆柱壳弹性屈曲承载力的影响。基于线性屈曲分析,提出弹塑性屈曲强度法中计算圆柱壳弹性临界剪切屈曲应力所需的长度相关系数Cτ的修正计算公式;基于考虑缺陷的几何非线性分析,提出弹塑性屈曲强度法（RRD）中考虑几何缺陷影响的参数αI的修正计算公式。
Abstract
Finite element models with helical meshes are developed to systematically evaluate the torsional buckling resistance of steel wind turbine towers. A comprehensive analysis of convergence behavior and meshing strategies is conducted, followed by linear elastic bifurcation analysis and geometrically nonlinear elastic analysis incorporating initial imperfections. A parametric study is conducted to systematically investigate the effects of key geometric parameters, including the diameter-to-thickness ratio, dimensionless length, and imperfection amplitude, on the elastic buckling capacity of cylindrical shells. Based on the results of the linear buckling analysis, a modified formulation for the length-dependent coefficient Cτ is proposed to calculate elastic critical shear buckling stresses within the Reference Resistance Design （RRD） framework. Additionally, the outcomes of the geometrically nonlinear analysis led to the development of a revised sensitivity parameter αI, which improves the accuracy of assessing imperfection sensitivity in RRD-based design methodologies. These proposed modifications improve the predictive capabilities of torsional buckling resistance in steel wind turbine towers, addressing a critical gap in current design practices.
关键词
风电机组 /
扭转荷载 /
有限元方法 /
屈曲行为 /
圆柱壳 /
弹塑性屈曲强度法
Key words
wind turbines /
torsional loadingal /
finite element method /
buckling behavior /
cylindrical shell /
reference resistance design
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