材料の加工硬化特性を考慮した骨組構造物の弾塑性解析

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Hitherto, structural analysis of ships have been greatly developed by the elastic frame theory, or by the method of limit analysis which afford only maximum loads. Most of ship structural members have deep depth compared with the length of span. Such framed structures may easily crack succeeding to local stress and strain concentrations before reaching maximum load. However, the elasto-plastic analysis of highly redundant framed structures raise the various difficulties in carring out numerical calculations, even if we use the digital computer, because it requires long computing time. On the other side, assumption of plastic hinge adopted in limit analysis, as is generally known, has great advantage of simplifying the treatment of this problem. In this paper, the authors propose the method of analyzing the stress and strain in framed structures beyond the elastic limit by assuming the elasto-plastic hinges of which characteristics are obtained by calculation of its equivalent moment〜relative-rotational-angle relationships based on elasto-plastic beam theory and by using elastic beam theory for the part between elasto-plastic hinges. Assuming the strain hardening characteristics of the materials, the elasto-plastic behavior of stress, strain, bending moment, deflection etc. are obtained for the beams and the framed structures by uses of computers. The results of analysis are compared with those obtained by the ideal rigid-plastic analysis and of experiments which prove rightfulness of the assumption of elasto-plastic hinge used in this theory. Finally, more wide applicability of this method for complex structures is suggested.
社団法人日本船舶海洋工学会の論文
1970-07-31

材料の加工硬化特性を考慮した骨組構造物の弾塑性解析

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