APPROXIMATE ANALYSIS OF FLEXURAL-TORSIONAL BUCKLING STRENGTH USING FLANGE FLEXURA L BUCKLING STRENGTH

A discussion on the design formulas for beam-column flexural-torsional buckling

Abstract

Flexural-torsional buckling strengths are approximately calculated by using compressive strut model and sandwich model. In the compressive strut model, flexural buckling strengths of the flange of H-shaped beam-columns are calculated so as to obtain the flexural-torsional buckling strengths. The sandwich model is used to calculate the flexural-torsional buckling strength of beam-columns subjected to axial compressive force and equal bending moment at both ends. The moment-axial force interaction curves obtained in this study and those from the design formulas proposed by authors are compared, taking the moment ratio and slenderness ratio as analytical parameters.