連続体近似に基づくブレース補剛単層2方向格子シェルの弾性座屈特性の評価

概要

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The present research aims to analyze and appreciate basic characteristics of elastic buckling behavior of braced single-layer two-way grid shells, based on continuum analogy. Buckling load and modeshape dramatically change in accordance with the rigidity of diagonal bracing, but the bucking formulas derived based on continuum analogy directly bring a comprehensive understanding on the buckling characteristics, and can predict linear buckling behavior within not so large error. Moreover, the degree of geometric nonlinear effect is correlated with a parameter also derived based on the buckling formulas. This paper discusses the linear buckling characteristics as well as elastic nonlinear buckling in which geometric nonlinear effect is taken into consideration: First, the change in linear buckling loads and modeshapes in accordance with the increase of bracing rigidity is outlined. Second, the expression of effective rigidities of braced two-way grid, and two linear buckling formulas representing general and member buckling are demonstrated and the applicability of the two formulas is tested by comparing with numerical solutions. Finally a correlation between the knockdown factor, an index which represents the degree of nonlinearity of behavior, and a new slenderness defined using the buckling formulas is found.
一般社団法人日本建築学会の論文
2008-03-25