11. On the Stiffening Effect of Hat-shaped Stiffeners on a Plate

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概要

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• Hat-shaped stiffeners have often been adopted in FRP ship constructions, not only because they are easily moulded on FRP hull laminates, but because their structural form is effective to stiffen the low rigidity of a FRP single-skin panel. The object of this research is to clarify the deformation mechanism of a plate stiffened with hat-stiffeners in view of obtaining fundamental design data. In part 1, the bending deformation of a fundamental structure is analyzed on a simply supported orthotropic plate stiffened with hat-stiffeners under uniform lateral load. An analytical model considering two joint lines of stiffener webs to a plate and the rotational spring equivalent to a stiffener web is proposed to modelize the stiffening effect of the torsional rigidity and the restraint of cross sectional deformation of a hat-stiffener on the bending deformation of a plate. A single stiffener model is also proposed considering the effective width of a plate. They are compared with detailed finite strip analyses on a plate reinforced by a single stiffener and with experimental results on plastic models. It is shown that the single stiffener model gives a good explanation of the bending deformation of a fundamental structure. Subsequently, the bending deformation of a plate stiffened with multiple hat-stiffeners is analyzed and compared with an equivalent orthotroic plate model using an effective torsional stiffness. It is made clear that the deformation behavior cannot be well explained by the conventional equivalent rigidity method on a stiffened plate with multiple hat-stiffeners. In part 2, the buckling deformation is analyzed on a simply supported orthotropic plate with a single hat-shaped longitudinal stiffener under uniaxial compression. An instability may occur in the form of local or overall buckling in such a fundamental plate structure considered, so that three analytical models are proposed to modelize the stiffening effect of a hat-stiffener, that is, overall buckling, wall buckling, and a rotational spring model. They are compared with detailed finite strip analyses and experimental results on plastic models. It is indicated that the simple model considering the rotational spring constant of a stiffener web gives a good explanation of the local buckling mode as well as the bending deformation as shown in part 1. The difference between buckling deformation mechanisms of hat-shaped and T-shaped stiffeners is also demonstrated based on these results.

• 社団法人日本船舶海洋工学会の論文

著者

• Kimpara Isao

  University Of Tokyo

• Takehana Mitsuo

  University Of Tokyo

• FUNATOGAWA Osamu

  University of Tokyo

関連論文

• 11. On the Stiffening Effect of Hat-shaped Stiffeners on a Plate

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