曲面構造の大変形時における抗負荷機構について : (その2)防撓材による補強効果

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Most of curved parts of ship hull are composed of thin shallow shells reinforced with stiffeners. These stiffeners are fitted for the sake of preventing from snapping through, reducing the corresponding stresses and increasing the ultimate strength of shell structure. And the stiffness of stiffeners should be determined on account of the effective reinforcement according to configulations and edge conditions of shell. The first report presented the elasto-plastic analysis on three kinds of shells by finite strip method. By the results of analysis, the mechanism of resisting external force in shell was fairly clarified. This paper presents an analytical method for stiffened shell in order to investigate the relation between stiffness of stiffener and strength of shell structure under various curvatures. In this analysis using the finite strip method, a stiffener is regarded as the sectorial plate elements. The results of this analysis on stiffened shells are obtained as following; 1) In the shell with small curvature, the strength depends upon bending moment rather than membrane force and the reinforcing effect of stiffener is valid likely as plate structure. 2) In the cylindrical shell with weak stiffness of stiffener, the yielding zone is tend to extend fast in stiffener rather than in shell panel and the structural stiffness is rapidly decreased according to enlarging plastic region in stiffener. 3) The distribution of membrane stress in high-rise shell has a tendency to be disturbed by fitting of stiffener and this fact is unfavorable from the point of view of structual strength.
社団法人日本船舶海洋工学会の論文
1987-08-25

曲面構造の大変形時における抗負荷機構について : (その2)防撓材による補強効果

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