荷重不整および形状初期不整を有する単層HPラチスシェルの座屈挙動と耐力評価

概要

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The buckling behavior of rigidly jointed shallow HP (hyperbolic paraboloidal) lattice shells under uniform loadings was studied in the previous paper. The purpose of this paper is to investigate the effect of loading imperfection and geometrical initial imperfection on the buckling behavior of HP lattice shells. Asymmetric loadings are assumed as the loading imperfections, and the similar shapes of the first eigenmodes of the shells without geometrical initial imperfection with the elasto-plastic buckling are adopted as the geometrical initial imperfections. First, the buckling behavior of HP lattice shells was examined by a series of analyses in consideration of several parameters, such as the magnitudes of imperfections and the central member angles of shells. Finally the initial yield load and the ultimate load were estimated by using Modified Dunkerley Formulation as a function, of generalized slenderness ratio A with knock-down factor 7.
2002-10-30