Rectangular plane surface hybrid monolayer lattice EP shell structure

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 rate γg of each grid from the in-plane displacement Li and to determine the out-of-plane deformation rate ψg of each grid from the out-of-plane displacement Wi. Weighting functions wi, wo for the in-plane deformation rate γg and the out-of-plane deformation rate ψg, respectively, are defined to match the degree of restraint of each grid. An evaluation coefficient κ, which is a function of numerical values for all or some of the in-plane deformation rate γg, the out-of-plane deformation rate ψg, 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 coefficient κ, and the in-plane stiffening members are provided for the grids situated along a line connecting the grids by the shortest distance.;COPYRIGHT: (C)2000,JPO