Abstract
In this paper, two simple models which complement one another in mirroring the plastic buckling properties of structures are analysed in detail to introduce a scheme for postbuckling and imperfection sensitivity analysis that is suitable for tackling real structures. The variation of the size of the unloading area is used as the perturbation parameter and a special perturbation scheme is designed to deal with the moving boundary problems caused by plastic unloading, so that the extension of Koiter's theory of initial elastic postbuckling to the plastic range becomes possible.
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