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Two types of stiffened plates are used in welded structures as follows: plates stiffened on one side and cellular ones, which consist of stiffeners welded between two deck plates. For a realistic cost comparison each type is optimised for minimum cost in the case of axial compression. Both plates are longitudinally stiffened by halved rolled I-section ribs. The deck plate thickness as well as the dimensions and number of stiffeners are sought, which minimise the cost function and fulfil the design and fabrication constraints. The cost function includes the material and fabrication costs. The design constraints relate to the overall and local plate buckling. It is shown that the cellular plate is cheaper than the plate stiffened on one side, since its large torsional stiffness enables us to use smaller plate thicknesses and smaller stiffener height.

Optimum Design and Cost Comparison of a Welded Plate Stiffened on One Side and a Cellular Plate Both Loaded by Uniaxial Compression