The present study is concerned with theoretical and numerical investigation of elastic stability of a thin-walled straight column which is composed of flat plates and subjected to uniform axial compression that acts at simply supported ends. An approach that differs slightly from existing methods in computing critical loads is proposed on the basis of Kirchhoff's hypothesis for the out-of-plane deformation of the plate and EulerBernoulli's hypothesis for its in-plane deformation.
In the theoretical part, a unified analysis in determining critical stresses of arbitrary plate assemblies is given, in which all possible interactions between column and local buckling are taken into account. Numerical results on torsionally weak columns with channel-sections show that the consideration of all possible interactions results in significant changes in column buckling stresses.
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