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Advances in Civil Engineering
Volume 2018, Article ID 8417208, 7 pages
https://doi.org/10.1155/2018/8417208
Research Article

Strength of Flanged and Plain Cruciform Members

Volgenau School of Engineering, Sid and Reva Dewberry Department of Civil, Environmental and Infrastructure Engineering, George Mason University, 4400 University Drive MS 6C1, Fairfax, VA 22030, USA

Correspondence should be addressed to Girum Urgessa; ude.umg@assegrug

Received 22 August 2017; Accepted 3 January 2018; Published 19 February 2018

Academic Editor: Li Li

Copyright © 2018 Nicholas Harris and Girum Urgessa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

There are two different types of cruciform members used in practice. Flanged cruciform sections are typically fabricated from two hot-rolled WT sections welded to the web of a standard hot-rolled I section, whereas plain cruciform sections are typically fabricated from two symmetric rectangular plates welded in the form of a cross. Cruciform members that are subjected to combined compression and bending are typically limited by torsional buckling unlike conventional compression members (such as W-shapes) that are typically limited by flexural (Euler) buckling about their local weak axis of bending. Detailed guidance on the analysis of flanged and plain cruciform members is scarce in literature. Hence, this paper presents numerical studies on the strength capacities of both flanged and plain cruciform members that are subjected to combined compression and bending effects. Analysis results show the ability of flanged and plain cruciform to resist lateral-torsional buckling over longer unbraced lengths, allowing development of efficient plastic resistance.