On certain aspects of global and local buckling modes in thin-walled column-beams

In the design of thin-walled column-beams must be taken into account the overall instability and the instability of component plates in the form of local plate bukling. This investigation is concerned with thin-walled closed and open cross-section elastic beams under axial compression or a constant bending moment. Buckling analysis includes cross-section distortion. The beams are assumed to be simply supported at the ends. The asymptotic expansion established by Byskov and Hutchinson is employed in the numerical calculations in the form of the transition matrix method. The calculations have been done for several types of beams.