Ultimate Strength of Stiffened Plates and Minimum Stiffness Ratio of Their Stiffeners (under Thrust)

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In this paper, a theoretical investigation into the effectiveness of a stiffener against the ultimate strength of a stiffened plate is performed. Series of buckling analyses, elastic large deflection analyses and elastic-plastic large deflection analyses are performed by the analytical method and the finite element method on the stiffened plate under thrust. Experiments are also carried out to confirm the theoretical results.On buckling of a stiffened plate, it is well known that there exists a minimum stiffness ratio of a stiffener to the plate, γ^B min, which gives the maximum limiting value of the buckling strength. Concerning the ultimate strength, it is found and confirmed that there exists a significant stiffness ratio of a stiffener to the plate, γ^U min, similar to γ^B min for the buckling strength. It is also found that there exist three typical collapse modes for the stiffened plate under thrust. (1) MODE OO ; overall collapse after overall buckling (2) MODE LO ; overall collapse after local buckling (3) MODE LL ; local collapse after local buckling Approximate methods are proposed to evaluate the ultimate strength and γ^U min of a multi-stiffened plate under thrust. The effects of initial imperfections such as welding residual stresses and initial deflection on ultimate strength and γ^U min of a stiffened plate are also discussed.
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