Losses caused by the recent fire incidents are demanding proper fire safety regulations and fire protection measures around the globe while construction cost and call for environmental protection are increasing. The expansion of cold-formed steel (CFS) construction to mid-rise buildings in recent times has therefore identified the need for the accurate prediction of the load bearing capacities of CFS columns in fire. Despite several useful studies on the compression capacities of CFS columns at elevated temperatures, effects of nonlinear elevated temperature stress-strain characteristics on the global buckling capacities of CFS columns have not been investigated yet. In this research, the effects of nonlinearity between proportional limit stress and yield strength, strain hardening between yield and ultimate strengths and varying yield strength to Young's modulus ratio on the capacities of pinned and fixed ended columns subject to flexural-torsional and flexural buckling were investigated using a detailed numerical parametric study involving 1320 finite element analysis results. The accuracy of current CFS design standards, such as AS/NZS 4600, AS 4100 and EC3 Part 1–2, in predicting the elevated temperature global buckling capacities was investigated, and new design rules were proposed for Australian and European standards.

由于最近的火灾事故造成的损失要求在全球范围内制定适当的消防安全法规和防火措施，同时建设成本和环境保护的要求也在增加。因此，最近将冷弯型钢（CFS）的建筑扩展到中高层建筑，这表明需要准确预测火灾中CFS柱的承载能力。尽管在高温下对CFS柱的抗压能力进行了一些有用的研究，但尚未研究非线性高温应力应变特性对CFS柱的整体屈曲能力的影响。在这项研究中，比例极限应力与屈服强度之间的非线性影响，使用涉及1320有限元分析结果的详细数值参数研究，研究了屈服强度和极限强度之间的应变硬化以及屈服强度与杨氏模量比的变化对受弯扭和挠曲屈曲的销钉和固定端柱的承载能力的影响。研究了当前CFS设计标准（例如AS / NZS 4600，AS 4100和EC3第1-2部分）在预测高温下全球屈曲能力方面的准确性，并针对澳大利亚和欧洲标准提出了新的设计规则。