Add time:07/18/2019         Source:sciencedirect.com

Although structural fire performance of hot-rolled carbon steel columns is already well known, limited design specifications are available for stainless steel columns. European fire design guidelines allow for a different material strength and stiffness degradation at high temperatures for stainless steel and, yet, the same buckling curve is recommended for stainless steel and carbon steel columns. This paper reports an experimental investigation on the structural behaviour of hollow steel columns under fire conditions for assessing mainly their fire resistance, critical temperatures and failure modes. The main variables tested included the: (a) cross-section type (circular, square); (b) axial load ratio (0.30 and 0.70); and (c) steel type (carbon and austenitic stainless steel). The structural fire behaviour of stainless steel columns was hence compared with similar carbon steel columns. Furthermore, European fire design methods both for the prediction of the temperature evolution on stainless steel members and for the estimation of the critical temperature of this type of column were also used to compare with experimental data. As well as that, the experimental results were still compared with predictions from other available analytical models, taking into account changes in the buckling curve established in the European design rules. Finally, such design rules were found to be over-conservative for high load ratios and so the development of a different design buckling curve might be useful for an accurate prediction of the fire resistance of stainless steel columns.

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