防撓平板の弾塑性大たわみ解析に関する簡易解法 : (その2)防撓板構造

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A large portion of a ship's hull consists of stiffened plates. When these plates are subjected to very large loads, material and geometrical nonlinearities accompanied by large deflections and elastic-plastic deformations, make an accurate or practical analytical solution, a rather difficult problem. Moreover, this leads to cumbersome numerical calculations in methods like the F.E.M.; whereby, the necessity of a simple analytical method is warranted for a realistic analysis of such structures. The analysis of the practical case of a stiffened plate structure is the aim of this paper. Here, we consider a plate structure with arbitrarily spaced and uni-directionally laid out stiffeners. The inter stiffener plate panels are considered to be having an aspect ratio large enough for the analytical purpose. A simplified analytical process for a plate strip, bounded at a finite width by two normals to the stiffener direction, is derived here. The first part of this investigation, which is already published, considered just one stiffener space of this strip as a fundamental element. The influence of various constraints induced on the boundaries of this strip by the adjacent panel spaces, on deformation patterns, yield and collapse loads were studied there. The present paper considers the plate strip as a row of continuously connected members by the substitution of all the stiffener positions with spring restrained nodal points. Thus a distributed load is assumed to be borne by an effective breadth in an inter nodal strip space, which could be considered as a simple beam, supported at the nodal points. The deformation process is considered as the effect of a large deflection. The post-deformation coordinate axes and the accompanying changes in the various geometrical relationships are traced out. The elastic-plastic deformations in each member is assumed to be fully borne by the hinges and, restricted to there only. Each member of the continuous strip is analysed likewise using the elastic-plastic hinged method. The elastic-plastic deformations in each member is assumed to be fully borne by the hinges and, restricted to there only. The two-dimensional stiffened plate model with the above simplified assumptions is studied in this paper. Nodal forces, moments and deflections for each member and their combined effect on the complete strip are investigated and the total stiffness equation is obtained.
社団法人日本船舶海洋工学会の論文
1990-03-15

防撓平板の弾塑性大たわみ解析に関する簡易解法 : (その2)防撓板構造

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