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Improved design rules for fixed ended cold-formed steel columns subject to flexural-torsional buckling

机译：弯扭屈曲固定端冷弯型钢柱的改进设计规则

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摘要

This paper has presented the details of an investigation into the flexural and flexural-fl buckling behaviour of cold-formed structural steel columns with pinned and fixed ends. Current design rules for the member capacities of cold-formed steel columns are based on the same non-dimensional strength curve for both fixed and pinned-ended columns. This research has reviewed the accuracy of the current design rules in AS/NZS 4600 and the North American Specification in determining the member capacities of cold-formed steel columns using the results from detailed finite element analyses and an experimental study of lipped channel columns. It was found that the current Australian and American design rules accurately predicted the member capacities of pin ended lipped channel columns undergoing flexural and flexural torsional buckling. However, for fixed ended columns with warping fixity undergoing flexural-torsional buckling, it was found that the current design rules significantly underestimated the column capacities as they disregard the beneficial effect of warping fixity. This paper has therefore proposed improved design rules and verified their accuracy using finite element analysis and test results of cold-formed lipped channel columns made of three cross-sections and five different steel grades and thicknesses.
机译：本文详细介绍了带有固定端和固定端的冷弯结构钢柱的挠曲和挠曲挠曲特性。对于冷弯钢柱的构件承载力，当前的设计规则基于固定和固定端柱的相同无量纲强度曲线。这项研究回顾了AS / NZS 4600和北美规范中当前设计规则在确定冷弯钢柱构件承载力方面的准确性，其中使用了详细的有限元分析结果和唇形槽钢柱的实验研究。结果发现，当前的澳大利亚和美国设计规则可以准确预测承受弯曲和弯曲扭转​​屈曲的销形端部带槽通道柱的构件承载力。但是，对于翘曲固定性经受挠曲-屈曲屈曲的固定端柱，发现当前的设计规则由于忽略了翘曲固定性的有益影响而大大低估了柱的承载能力。因此，本文提出了改进的设计规则，并使用有限元分析和由三个截面和五种不同钢种和厚度制成的冷弯唇形通道柱的测试结果验证了其准确性。

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