12. Ultimate Strength of Stiffened Plates and Minimum Stiffness Ratio of Their Stiffeners
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概要
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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 the buckling analyses, the elastic large deflection analyses and the elastic-plastic large deflection analyses are performed by the analytical method and the finite element method on the stiffened plate under thrust and the girder with a horizontal stiffener under bending. Experiments are also carried out on the stiffened plate under thrust 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 γ^B_<min> for the buckling strength. It is also found that there exist three typical collapse modes for the stiffened plate under thrust and the girder with a horizontal stiffener under bending, that is, (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 and a girder with a horizontal stiffener under bending. The effects of initial imperfections such as welding residual stresses and initial deflection on ultimate strength and γ^U_<min> of a stiffened plate under thrust are also discussed.
- 社団法人日本船舶海洋工学会の論文
著者
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Ueda Yukio
Welding Research Institute, Osaka University
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Yao Tetsuya
Faculty Of Engineering Hiroshima University
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Ueda Yukio
Welding Research Institute Of Osaka University
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