Influence of initial imperfections on the collapse behaviour of box-columns
Abstract
In this work the analysis of the post-buckling state in the elasto-plastic range of a box-colunm
subjected to uniform compression in the elasto-plastic range is preseoted.
The problem is investigated using Rayleigh-Ritz variational method. The stress-strains
relations in the plastic range are determined on the basis of the flow theory of plasticity.
The proposed method is a combination of analytical and numerical solutions.
Different materiał stress-strain curves and initial imperfections such: out-of-flatness and
residual stresses are taken into account. The load-shortening curves for column of
different geometrical parameters and material properties are shown in diagrams.
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