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Lateral buckling strength of simply supported LiteSteel beams subject to moment gradient effects

Kurniawan, Cyrilus Winatama & Mahendran, Mahen (2009) Lateral buckling strength of simply supported LiteSteel beams subject to moment gradient effects. Journal of Structural Engineering, 135(9), pp. 1058-1067.

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Abstract

The flexural capacity of of a new cold-formed hollow flange channel section known as LiteSteel beam (LSB) is limited by lateral distortional buckling for intermediate spans, which is characterised by simultaneous lateral deflection, twist and web distortion. Recent research has developed suitable design rules for the member capacity of LSBs. However, they are limited to a uniform moment distribution that rarely exists in practice. Many steel design codes have adopted equivalent uniform moment distribution factors to accommodate the effect of non-uniform moment distributions in design. But they were derived mostly based on the data for conventional hot-rolled, doubly symmetric I-beams subject to lateral torsional buckling. The effect of moment distribution for LSBs, and the suitability of the current steel design code rules to include this effect for LSBs are not yet known. This paper presents the details of a research study based on finite element analyses of the lateral buckling strength of simply supported LSBs subject to moment gradient effects. It also presents the details of a number of LSB lateral buckling experiments undertaken to validate the results of finite element analyses. Finally, it discusses the suitability of the current design methods, and provides design recommendations for simply supported LSBs subject to moment gradient effects.

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4 citations in Web of Science®

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ID Code: 30255
Item Type: Journal Article
Keywords: LiteSteel beams, Lateral distortional buckling, Lateral torsional buckling, Non-uniform moment distribution, Moment gradient , Finite element analyses
DOI: 10.1061/(ASCE)ST.1943-541X.0000044
ISSN: 0733-9445
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2009 American Society of Civil Engineers.
Deposited On: 05 Feb 2010 09:54
Last Modified: 01 Mar 2012 00:06

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