Influence of modification of boundary conditions on load carrying capacity in thin-walled columns in the second order approximation

Abstract The influence of modification of boundary conditions at both ends of the structures regarding interactive buckling on the postbuckling behaviour of thin-walled elastic columns with imperfections is studied. The investigation concerns thin-walled closed and open cross-section columns under axial compression. The columns 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 aim of the paper is to improve the study of the equilibrium path in the postbuckling behaviour of imperfect structures regarding the second order approximation.

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