This paper introduces a computer based, fully integrated design optimization (FIDO) system to allow engineers to produce efficient engineering structural designs for a set of loading conditions. The basic problem may be summarised as follows: given the loading and support conditions what is the optimal structure? To solve such a problem, a three stage process is developed involving: (a) preliminary optimal layout design, (b) structural model redefinition with parameterization and (c) refined optirnal shape and sizing design.

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