Nonlinear structural behaviour and design formulae for calculating the ultimate strength of stiffened curved plates under axial compression

•Buckling and post-buckling behaviour of stiffened curve plate is investigated.•Numerical studies to simulate the nonlinear ultimate bending strength behaviour.•Effects of varying geometrical parameters on buckling ultimate strength capacity•Proposed design curves for of stiffened curve plate.

Cylindrically curved and stiffened plates are often used in ship and offshore structures. For example, they can be found in the cambered decks, fore and aft side shells and circular bilge parts of ships. A number of studies have investigated curved plates in which the buckling/ultimate strength is increased according to the curvature under various loading scenarios and design formulas. However, information regarding the nonlinear structural behaviour and design formulas for calculating the ultimate strength of the stiffened curved plates is currently limited. In this paper, a series of finite element analyses are performed on stiffened curved plates with varying geometric parameters. The existing curvatures are also analysed to clarify the effects of these parameters on the buckling/post-buckling characteristics and collapse behaviour under axial compression. The results are used to derive closed-form expressions to predict the ultimate compressive strength of curved stiffened plates for marine applications.