Buckling of stiffened plates and design of stiffeners

Abstract This paper presents a closed-form solution of critical instability stresses for simply supported rectangular plates with an arbitrary number of stiffeners in longitudinal and/or transverse directions. It is shown that there are only two buckling modes that are coupled to each other for single direction stiffened plates and four for double direction stiffened plates. The coupling of buckling modes represents the feature of interactions of global and local buckling modes. It is also shown that stiffeners have twofold effects on the critical instability stress, one is by enhancing the “stiffness”, the other is by changing the buckling mode. Because of the twofold effects it becomes difficult to apply the conventional optimum method to design the stiffeners and the optimum design of stiffeners still remains a difficult problem. This paper discusses the way by which the stiffeners can effectively enhance the buckling resistance of plates.

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