Murtaza, Hasan and Kucukler, Merih (2023) Fire design of steel columns through second-order inelastic analysis with strain limits. Thin-Walled Structures, 184 . 110458. doi:10.1016/j.tws.2022.110458 ISSN 0263-8231.

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Abstract

A structural steel fire design approach through second-order inelastic analysis with strain limits is proposed and applied to the fire design of steel columns as a first step in the establishment of a novel fire design framework for steel structures in this paper. The proposed method is carried out using beam finite elements, utilising their computational efficiency. In the proposed design approach, the strength and stiffness deterioration of steel in fire, the spread of plasticity, global instability effects, indirect fire actions and thermal expansion are fully taken into account through second-order inelastic analysis, while strain limits are employed to consider the deleterious influence of local buckling on the ultimate resistance. Ultimate capacity of a steel member or system is determined by (i) the load or temperature level at which the predefined strain limit is attained or (ii) the peak load or critical temperature observed during the analysis, whichever occurs first. A systematic numerical parametric study is carried out through nonlinear shell finite element modelling, taking into account a high number of I-section and hollow section steel columns whose response is considered (i) using isothermal and anisothermal analysis techniques and (ii) with and without axial and rotational end-restraints. It is demonstrated that the proposed fire design approach consistently furnishes significantly more accurate capacity and limit temperature predictions for steel columns in fire relative to EN 1993-1-2 [1] design provisions.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Columns, Iron and steel -- Design and construction, Building, Fireproof , Columns, Iron and steel -- Safety measures, Buckling (Mechanics), Plasticity , Strains and stresses , Finite element method , Fire testing
Journal or Publication Title:	Thin-Walled Structures
Publisher:	Elsevier
ISSN:	0263-8231
Official Date:	March 2023
Dates:	Date Event March 2023 Published 5 January 2023 Available 9 December 2022 Accepted 7 September 2022 Submitted
Volume:	184
Article Number:	110458
DOI:	10.1016/j.tws.2022.110458
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	5 January 2023
Date of first compliant Open Access:	5 January 2023

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