On elastic buckling of bisymmetric H-section steel elements under bending and compression

摘要

In this state-of-the-art paper, methods of the elastic buckling evaluation applied to perfect bi-symmetric double-tee section beam-columns are summarized. Basic approaches for flexural-torsional buckling of an elastic beam-column, based on retaining the trigonometric functions of the twist rotation, are formulated. The effect of prebuckling displacements on the critical state is briefly discussed in reference to the classical approach based on the linear stability analysis, in which the critical state is evaluated using only the prebuckling stress resultants. A general situation of elastic instability of beam-columns under moment gradient in reference to the directional bending about the section principal axis of greater moment of inertia is obtained. Conclusions with regard to the improvement made with regard to critical state evaluation are also presented.