落し糸間の膜面に曲率がある二重空気膜構造板の有効剛性評価

概要

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Effective axial, bending and shear stiffness of some air-inflated dual membrane plates, which consist of two covers of membrane material, internal pressure and strings connecting these covers vertically or diagonally, are examined theoretically and numerically considering curvature of covers which is affected by internal pressure load and tensile forces of strings. Airmat is a kind of those structures, which contains many drop cords which are vertical strings to keep membrane surface flat. As width of each drop cord increases, curvature of membrane surface can't be neglected, and effective axial and bending stiffness vary considerably. Both of those stiffness decrease as ξ ( b/h : ratio of width between each drop cord to length of drop cord) increases. However bending stiffness increases again as £ exceeds 1.0 because of increase of depth between upper and lower membrane covers. The value of internal pressure is equivalent to effective shear modulus due to the geometrical nonlinear effect of initial stress in membrane.
社団法人日本建築学会の論文
1997-09-30