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Elastic lateral-torsional buckling of general cold-formed steel beams under uniform moment
AbstractThe 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.
Graphical abstract
HighlightsA 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.
Elastic lateral-torsional buckling of general cold-formed steel beams under uniform moment
AbstractThe 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.
Graphical abstract
HighlightsA 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.
Elastic lateral-torsional buckling of general cold-formed steel beams under uniform moment
Glauz, R.S. (author)
Thin-Walled Structures ; 119 ; 586-592
2017-07-12
7 pages
Article (Journal)
Electronic Resource
English
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