Journal
JOURNAL OF FIRE SCIENCES
Volume 38, Issue 2, Pages 156-172Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0734904119888823
Keywords
Fire resistance; stainless steel; circular hollow sections; columns; numerical analysis
Funding
- Portuguese Operational Program Competividade e Internacionalizacao'', in its FEDER/FNR component [StaSteFi -POCI-01-0145-FEDER-030655]
- Portuguese Foundation for Science and Technology (FCT), in its State Budget component (OE)
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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.
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