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Flexural stiffness reduction for stainless steel SHS and RHS members prone to local buckling
Thin-Walled Structures ( IF 6.4 ) Pub Date : 2020-07-07 , DOI: 10.1016/j.tws.2020.106939
Yanfei Shen , Rolando Chacón

In this paper, flexural stiffness reduction factor formulations, applicable to stainless steel members with compact cold-formed square and rectangular hollow section (SHS and RHS), are extended to account for local buckling effects and initial localized imperfection (ω). Local buckling effects and the influence of ω are accounted for by means of reducing the gross section resistance using a strength reduction factor ρ. ρ, determined by the Direct Analysis Method, depending on cross-section slenderness, is adopted. For in-plane stainless steel elements with non-compact and slender sections, results determined by the extended flexural stiffness reduction factor coupled with Geometrically Nonlinear Analysis (GNA) are verified against those determined by Geometrically and Materially Nonlinear Analysis with Imperfections (GMNIA). It is found that GNA with the extended flexural stiffness reduction factor (using beam element) generally achieves the accuracy of GMNIA (using shell element). Probabilistic studies based on 3D models with random ω are carried out to evaluate the effect of uncertainty in ω on the accuracy of GNA with the extended beam-column flexural stiffness reduction factor.



中文翻译:

不锈钢SHS和RHS构件的抗弯刚度降低,易于局部屈曲

在本文中,抗弯刚度减小因子公式适用于具有紧凑的冷弯方形和矩形空心截面(SHS和RHS)的不锈钢构件,并扩展了其解释局部屈曲效果和初始局部缺陷(ω)的范围。局部屈曲效应和ω的影响是通过使用强度折减系数ρ减小总截面电阻来解决的。采用由直接分析法根据截面细长度确定的ρ。对于具有非紧凑细长截面的面内不锈钢元件,将由扩展抗弯刚度减小系数与几何非线性分析(GNA)结合确定的结果与由几何和材料非线性不完美分析(GMNIA)确定的结果进行验证。发现具有增大的弯曲刚度减小因子(使用梁单元)的GNA通常可以达到GMNIA(使用壳单元)的精度。进行了基于带有随机ω的3D模型的概率研究,以评估ω的不确定性对具有扩展梁柱抗弯刚度减小因子的GNA精度的影响。

更新日期:2020-07-07
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