DSM Design of Cold‐Formed Steel Columns Failing in Flexural‐Torsional Modes at Elevated Temperatures. Issue 2 (1st September 2021)

• Record Type: Journal Article
• Authors: Bicelli, Antonio; Landesmann, Alexandre; Camotim, Dinar; Dinis, Pedro
• Is Part Of: Ce/papers. Volume 4:Issue 2/4(2021)
• Page Start: 1272
• Page End: 1281
• Publication Date: 2021-09-01
• Subjects: Cold‐formed steel columns -- Flexural‐torsional buckling and collapse -- Numerical simulations -- Elevated temperatures -- Fire design -- Ultimate strength -- Direct Strength Method (DSM) design; Civil engineering -- Periodicals; 624
• DOI: 10.1002/cepa.1421
• Languages: English
• ISSNs: 2509-7075

Abstract

Abstract: The purpose of this work is to extend the scope of the previous studies, by considering fixed‐ended columns under elevated temperatures (up to 800° C) with three cross‐section shapes (lipped channels, racks and stiffened lipped channels), various cross‐section dimensions (five per shape) and different lengths. The results presented and discussed consist of column FT post‐buckling equilibrium paths and failure loads, which are obtained through geometrically and materially non‐linear Ansys SFEA. In order to cover a wide FT slenderness range, several room‐temperature yield stresses are considered. The model prescribed in EC3‐1.2, for cold‐formed steel, is adopted to describe the temperature‐dependence of the steel material properties. Finally, the numerical failure loads obtained by the authors, together with numerical and experimental ones collected from the literature are used to propose a modification of the DSM‐based FT strength curves developed previously by authors and assess the merits of the new design curves. It is shown that the proposed modification improves visibly the failure load prediction quality, thus providing encouragement to continue the search for an efficient and reliable DSM‐based design approach for columns failing in FT modes at elevated temperatures.