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http://dx.doi.org/10.7781/kjoss.2017.29.2.123

Ultimate Axial Strength of Longitudinally Stiffened Cylindrical Steel Shell for Wind Turbine Tower  

Ahn, Joon Tae (Dept. of Civil Eng., Myongji University)
Shin, Dong Ku (Dept. of Civil Eng., Myongji University)
Publication Information
Journal of Korean Society of Steel Construction / v.29, no.2, 2017 , pp. 123-134 More about this Journal
Abstract
Ultimate axial strength of longitudinally stiffened cylindrical steel shells for wind turbine tower was investigated by applying the geometrically and materially nonlinear finite element method. The effects of radius to thickness ratio of shell, shape and amplitude of initial imperfections, area ratio between effective shell and stiffener, and stiffener spacing on the ultimate axial strength of cylindrical shells were analyzed. The ultimate axial strengths of stiffened cylindrical shells by FEA were compared with design buckling strengths specified in DNV-RP-C202. The shell buckling modes obtained from a linear elastic bifurcation FE analysis as well as the weld depression during fabrication specified in Eurocode 3 were introduced in the nonlinear FE analysis as initial geometric imperfections. The radius to thickness ratio of cylindrical shell models was selected to be in the range of 50 to 200. The longitudinal stiffeners were designed according to DNV-RP-C202 to prevent the lateral torsional buckling and local buckling of stiffeners.
Keywords
Cylindrical shell; Longitudinal stiffener; Axial buckling strength; Finite element method; Initial imperfection;
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