Lateral-Torsional Buckling of Built-Up Beam Columns

by Hiroshi Yoshida, Asst. Prof. of Civ. Engrg.; Kanazawa Univ., Kanazawa, Japan,
Susumu Nishida, Res. Asst. in Civ. Engrg.; Kanazawa Univ., Kanazawa, Japan,

Serial Information: Journal of the Structural Division, 1973, Vol. 99, Issue 7, Pg. 1713-1716

Document Type: Journal Paper


The lateral-torsional buckling strength of beam columns in both the elastic and the inelastic ranges is compared for (1) the influence of the residual stress patterns which are idealized for as-rolled and as-welded flange sections, and (2) the effect of the deterioriation in the St. Venant stiffness as a result of yielding. In this note, the cross-sectional properties in the inelastic range are numerically calculated by dividing the cross section into finite elements for given bending moment under an axial thrust. Additionally, the lateral-torsional buckling strength is calculated by the finite difference method applying the cross-sectional properties numerically obtained for the moment along the length of a beam-column. The numerical results are shown in several examples.

Subject Headings: Beam columns | Cross sections | Torsion | Buckling | Structural strength | Inelasticity | Moment (mechanics) | Residual strength

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