連続防撓パネルの局部座屈強度に対する諸因子の影響について

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Stiffened plates in ship structures are so designed that a local panel buckling takes place between stiffeners prior to an overall buckling and a local stiffener buckling. In general, buckling strength of local panel is evaluated assuming that the local panel is simply supported along the edges. However, in actual stiffened plates, local buckling strength is expected to increase due to the effect of torsional stiffness of stiffeners. Lateral pressure also increases the buckling strength of a continuous stiffened plate, because the plates under lateral pressure deform as if they were clamped along their edges, and this resists the occurrence of deflection of sinusoidal buckling mode. Contrary to these, welding residual stresses produced by fillet welding generally reduce the buckling strength. In this paper, semi-analytical formulae for estimating elastic local buckling strength of a continuous stiffened plate subjected to bi-axial thrust and lateral pressure are derived considering the combined effect of torsional stiffness of stiffener, welding residual stress and lateral pressure. Elastic eigen-value analysis and elastic large deflection analysis are performed using FEM, and the results are compared with those estimated by the proposed formulae. It is revealed that the proposed formula gives an estimate of elastic buckling strength which is in good agreement with the FEM results. A series of buckling strength analysis is performed for the deck and bottom plating of actual ships, and the influence of the above mentioned factors on the local buckling strength is discussed, including an interactive effect of stiffener and welding residual stress.
社団法人日本船舶海洋工学会の論文
1999-03-29

連続防撓パネルの局部座屈強度に対する諸因子の影響について

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