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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Abstract | 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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AbstractList | 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.
[Display omitted]
•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. |
Author | Glauz, R.S. |
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CitedBy_id | crossref_primary_10_1016_j_tws_2023_110535 crossref_primary_10_2139_ssrn_3868235 crossref_primary_10_1016_j_solener_2023_03_038 crossref_primary_10_1061__ASCE_ST_1943_541X_0002764 crossref_primary_10_1177_1369433218795601 crossref_primary_10_1016_j_istruc_2021_10_046 crossref_primary_10_1590_1679_78255304 crossref_primary_10_1016_j_tws_2018_04_012 |
Cites_doi | 10.1061/(ASCE)0733-9445(1992)118:11(2949) 10.1061/(ASCE)0733-9445(1992)118:11(2967) |
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Keywords | Non-symmetric sections Cold-formed steel Lateral-torsional buckling Non-principal axes |
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References | North American Specification for the Design of Cold-Formed Steel Structural Members, 2016 Edition. American Iron and Steel Institute, Washington, DC, 2016. Peköz, Winter (bib5) 1969; 95 Timoshenko, Gere (bib4) 1961 Cold-Formed Steel Design Manual, 2013 Edition. American Iron and Steel Institute, Washington, DC, 2014. Pi, Trahair (bib6) 1992; 118 Pi, Trahair (bib7) 1992; 118 Vlasov (bib3) 1961 10.1016/j.tws.2017.07.010_bib2 10.1016/j.tws.2017.07.010_bib1 Vlasov (10.1016/j.tws.2017.07.010_bib3) 1961 Peköz (10.1016/j.tws.2017.07.010_bib5) 1969; 95 Timoshenko (10.1016/j.tws.2017.07.010_bib4) 1961 Pi (10.1016/j.tws.2017.07.010_bib6) 1992; 118 Pi (10.1016/j.tws.2017.07.010_bib7) 1992; 118 |
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Title | Elastic lateral-torsional buckling of general cold-formed steel beams under uniform moment |
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