補強材の最小剛比について(第2報)

概要

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In the previous report, the authors clarified the existence of the minimum stiffness ratio, γ^U_<min>, of a stiffener against the ultimate strength of a stiffened plate in similar to the buckling strength, γ^B_<min>. In this report, elastic large deflection analysis is performed on the stiffened plate, and the phenomenon of the secondary buckling after the primary buckling is indicated. Then, a series of experiment is conducted to confirm the phenomena predicted by the theory. From these theoretical and experimental results, an approximate analytical method to determine γ^U_<min> is newly proposed as the intersection of the secondary buckling strength curve and ultimate strength curve of a locally failured plate, when there exists no initial deflection. When there exists initial deflection, the effective minimum stiffness ratio _<eff>γ^U_<min> is defined as the intersection of a curve of the initial yielding of bending stress of a stiffener and that of membrane stress of a plate. This method can also be applied to determine ^U_<min> of a stiffened plate with arbitary aspect ratio and arbitary number of stiffeners. The effect of welding residual stresses on the buckling and ultimate strength is also discussed, together with on ^U_<min> and _<eff>^U_<min> and the minimum stiffness ratio against the buckling strength, ^B_<min>.
社団法人日本船舶海洋工学会の論文