バルクキャリヤの構造初期計画システムの構築 : その3 二軸圧縮場の座屈評価を考慮した最適設計法

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Until now, the authors have developed an initial hull structure planning and hull weight optimization system. In previous papers, simplified evaluation method for double bottom strength (SAP/BC) and application of Genetic Algorithms (GA) to this system were proposed. However, we need to evaluate buckling strength of the ship bottom plating because significant compression stresses in both longitudinal and transverse directions occur, and buckling strength becomes severe, especially for bottom plating in an empty hold of a alternate loaded bulk carrier. Therefore, in this paper, at first, we propose a simplified evaluation method of buckling eigenvalue analysis, considering out-of-plane deformation of longitudinal stiffeners in the light of the study of Yao, Fujikubo et al. Next, the deformation and redistribution of membrane stresses after the elastic buckling under combined bi-axial thrust and lateral pressure conditions are investigated based on Marguerre's method. At last, we compare the results of the calculation by present methods with those by FEM buckling eigenvalue analysis and non-linear FEM analysis, and find that they show good agreement with each other.
社団法人日本船舶海洋工学会の論文
2001-03-12