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Post-buckling behaviour and strength of cold-formed steel lipped channel columns experiencing distortional/global interaction

机译:经历变形/整体相互作用的冷弯型钢唇形槽柱的屈曲后行为和强度

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This paper reports the results of a numerical investigation concerning the elastic and elastic-plastic post-buckling behaviour of cold-formed steel lipped channel columns affected by distortional/global (fiexural-torsional) buckling mode interaction. The results presented and discussed were obtained by means of analyses performed using the finite element code Abacus and adopting column discretisations into fine 4-node isoparametric shell element meshes. The columns analysed (i) are simply supported (locally/globally pinned end sections that may warp freely), (ii) have cross-section dimensions and lengths that ensure equal distortional and global (flexural-torsional) critical buckling loads, thus maximising the distortional/global mode interaction effects, and (iii) contain critical-mode initial geometrical imperfections exhibiting different configurations, all corresponding to linear combinations of the two "competing" critical buckling modes. After briefly addressing the lipped channel column "pure" distortional and global post-buckling behaviours, one presents and discusses in great detail a fair number of numerical results concerning the post-buckling behaviour and strength of similar columns experiencing strong distortional/global mode interaction effects. These results consist of (i) elastic (mostly) and elastic-plastic non-linear equilibrium paths, (ii) curves or figures providing the evolution of the deformed configurations of several columns (expressed as linear combination of their distortional and global components) and, for the elastic-plastic columns, (iii) figures enabling a clear visualisation of (iii,) the location and growth of the plastic strains and (iii2) the characteristics of the failure mechanisms more often detected in the course of this research work.
机译:本文报告的数值研究结果涉及受变形/整体(弯曲-扭转)屈曲模式相互作用影响的冷弯型钢唇形通道柱的弹性和弹塑性后屈曲行为。提出和讨论的结果是通过使用有限元代码Abacus进行分析并采用列离散化为精细的4节点等参壳单元网格获得的。分析的柱(i)得到简单支撑(局部/全局固定的端部段可能会自由翘曲),(ii)的横截面尺寸和长度确保相等的变形和整体(挠曲-扭转)临界屈曲载荷,从而最大程度地提高了变形/整体模式相互作用效应,以及(iii)包含展现出不同配置的临界模式初始几何缺陷,所有缺陷均与两种“竞争”临界屈曲模式的线性组合相对应。在简要介绍了唇形通道柱“纯”的变形和整体后屈曲行为后,人们提出并详细讨论了许多数值结果,这些数值结果涉及相似柱经受强变形/整体模式相互作用时的后屈曲行为和强度。 。这些结果包括(i)弹性(主要是)和弹塑性非线性平衡路径,(ii)曲线或图形,这些曲线或图形提供了几根柱的变形构型的演变(表示为它们的变形和整体分量的线性组合),以及,对于弹塑性柱,(iii)可以清楚地显示(iii)塑性应变的位置和增长以及(iii2)在本研究过程中经常发现的破坏机理特征的图形。

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