| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for selecting the placement position of a stiffening member for a single-latticed shell structure, whereby the required buckling resistance can be obtained from required minimum stiffening and a portion to be stiffened can be selected rapidly. SOLUTION: The in-plane displacement Li and the out-of-plane displacement Wi of the joint of each grid (g) in a single-latticed shell without stiffeners are calculated to determine the in-plane deformation rateγg of each grid from the in-plane displacement Li and to determine the out-of-plane deformation rateψg of each grid from the out-of-plane displacement Wi. Weighting functions wi, wo for the in-plane deformation rateγg and the out-of-plane deformation rateψg, respectively, are defined to match the degree of restraint of each grid. An evaluation coefficientκ, which is a function of numerical values for all or some of the in-plane deformation rateγg, the out-of-plane deformation rateψg, the weighting function wi, and the weighting function wo, is calculated for each grid. Some of the grids that can be regarded as increasing buckling load by placing in-plane stiffening members are selected on the basis of the evaluation coefficientκ, and the in-plane stiffening members are provided for the grids situated along a line connecting the grids by the shortest distance.
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