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On the buckling of axially restrained steel columns in fire

Shepherd, P.G. and Burgess, I.W. (2011) On the buckling of axially restrained steel columns in fire. Engineering Structures, 33 (10). pp. 2832-2838. ISSN 0141-0296

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Abstract

This paper describes the behaviour of restrained steel columns in fire. It follows the introduction of extra load into the column through the axial restraint of the surrounding cooler structure and the consequential buckling. Key to this understanding is the post-failure behaviour and re-stabilisation of the column, which is discussed with reference to a finite element model and an analytical model. Through bi-directional control of the temperature, the finite element model allows the snap-back behaviour to be modelled in detail and the effects of varying slenderness and load ratio are investigated. The analytical model employs structural mechanics to describe the behaviour of a heated strut, and is capable of explaining both elastic and fully plastic post-buckling behaviour.

Through this detailed explanation of what happens when a heated column buckles, the consequences for steel-framed building design are discussed. In particular, the need to provide robustness is highlighted, in order to ensure that alternative load paths are available once a column has buckled and re-stabilised. Without this robustness, the dynamic shedding of load onto surrounding structures may well spread failure from a fire's origin and lead to progressive collapse. (C) 2011 Elsevier Ltd. All rights reserved.

Item Type: Article
Copyright, Publisher and Additional Information: © 2011 Elsevier. This is an author produced version of a paper subsequently published in Engineering Structures. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Steel; Columns; Buckling; Fire resistance; Axial forces; Nonlinear analysis
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 05 Dec 2011 16:14
Last Modified: 08 Feb 2013 17:35
Published Version: http://dx.doi.org/10.1016/j.engstruct.2011.06.007 ...
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.engstruct.2011.06.007
URI: http://eprints.whiterose.ac.uk/id/eprint/43500

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