RESEARCH ARTICLE


Flexural Capacity of Locally Buckled Steel I-Beams Under Moment Gradient



Amin Mohebkhah*, 1, Behrouz Chegeni2
1 Structural Engineering Division, Faculty of Civil and Architectural Engineering, University of Malayer, Malayer, Iran
2 Young Researchers and Elite Club, Khorramabad Branch, Islamic Azad University, Khorramabad, Iran


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Creative Commons License
© 2013 Mohebkhah and Chegeni

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Structural Engineering Division, Faculty of Civil and Architectural Engineering, University of Malayer,Malayer, Iran; Tel: +98 0851 2232346 ; Fax: +98 0851 2221977; E-mail: amoheb@malayeru.ac.ir


Abstract

Lateral-torsional buckling (LTB) and flange local buckling (FLB) are treated as two independent phenomena in AISC-LRFD 360-10 in which the flexural capacity of locally buckled beams is determined as the minimum value obtained for the limit states of LTB and FLB. A 3-D nonlinear finite-element model using ABAQUS is developed in this research to investigate the interactive flexural capacity of steel I-beams with compact web under moment gradient. It was found that the AISC approach is adequate for beams with compact or noncompact sections, however, too conservative for beams with slender flanges representing a considerable interaction between LTB and FLB limit states.

Keywords: Lateral-torsional buckling, flange local buckling, finite element method, interactive buckling, moment gradient, I-beam.