Elastic lateral-torsional buckling of general cold-formed steel beams under uniform moment
The design of unbraced cold-formed steel beams must consider lateral-torsional buckling due to the low torsional stiffness associated with open cross-sections. The American Iron and Steel Institute incorporated design equations for the critical elastic lateral-torsional buckling stress in the North...
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Published in | Thin-walled structures Vol. 119; pp. 586 - 592 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.10.2017
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Subjects | |
Online Access | Get full text |
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Summary: | The design of unbraced cold-formed steel beams must consider lateral-torsional buckling due to the low torsional stiffness associated with open cross-sections. The American Iron and Steel Institute incorporated design equations for the critical elastic lateral-torsional buckling stress in the North American Specification for the Design of Cold-Formed Steel Structural Members. These equations are based on elastic theory for singly-symmetric and doubly-symmetric sections. However, the equation for point-symmetric sections is only a rough approximation. Furthermore, there are no provisions for lateral-torsional buckling of non-symmetric sections, or sections oriented to non-principal axes. This paper investigates and develops a general formulation of the lateral-torsional buckling equation to broadly cover all cold-formed steel cross-sections.
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•A general form of the lateral-torsional buckling equation has been developed.•This equation is applicable to non-symmetric shapes oriented to non-principal axes.•Numerical methods provided results with good agreement.•Predictions for point-symmetric sections are improved over current specifications.•This solution benefits the engineer so that more complex methods are not required. |
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ISSN: | 0263-8231 1879-3223 |
DOI: | 10.1016/j.tws.2017.07.010 |