Stainless steel has countless desirable characteristics for a structural material. Although initially more expensive than conventional carbon steel, stainless steel structures can be competitive due to their smaller need for fire protection material and lower life-cycle cost, thus contributing to a more sustainable construction. The most common stainless steel groups used in structural applications are the austenitic, ferritic and austenitic–ferritic (also known as Duplex grades). This work presents a numerical study on the behaviour of stainless steel circular hollow section members under axial compression at elevated temperatures, with different cross-section slenderness. The numerically obtained ultimate load-bearing capacities are compared with simplified calculation formulae from Eurocode 3 for columns under fire situation. A parametric study, considering different stainless steel grades from the aforementioned groups, cross-sectional classes and slendernesses, is here presented for different elevated temperatures. The numerical analyses were performed with the finite element programme SAFIR, with material and geometric non-linear analysis considering imperfections. Comparisons between the numerical results and the Eurocode 3 rules demonstrated that a specific design approach must be developed for stainless steel columns under fire situation.

中文翻译：

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不锈钢圆形空心截面柱耐火性能数值研究

不锈钢具有无数理想的结构材料特性。尽管最初比传统碳钢贵，但不锈钢结构由于对防火材料的需求较小且生命周期成本较低，因此具有竞争力，从而有助于实现更可持续的建筑。结构应用中最常见的不锈钢组是奥氏体、铁素体和奥氏体-铁素体（也称为双相不锈钢）。这项工作对不锈钢圆形空心截面构件在高温下轴向压缩下的行为进行了数值研究，具有不同的截面细长。将数值获得的极限承载能力与欧洲规范 3 中针对火灾情况下的柱的简化计算公式进行比较。一项参数研究，考虑到来自上述组的不同不锈钢等级、横截面等级和细长，这里针对不同的升高温度进行介绍。数值分析是用有限元程序 SAFIR 进行的，材料和几何非线性分析考虑了缺陷。数值结果与欧洲规范 3 规则之间的比较表明，必须为火灾情况下的不锈钢柱制定特定的设计方法。