Abstract
Current discussions concerning the validity of simultaneous buckling as a criterion of optimization are quantified by the formulation of a simple design problem for a thin-walled strut. Here, simultaneity of overall and local buckling leads to a well-defined optimum for a perfect column, and recent calculations by A. van der Neut are used to examine the extent to which this optimum can be eroded away by imperfection-sensitivity associated with coupled-branching behaviour. The optimum is seen to shift quite significantly for small imperfections, and for larger ones it can be entirely eliminated.
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