本論文は, 架設中の吊橋の構造系や, 柔軟な立体吊構造トラスなどの大変形解析のための厳密理論とその応用プログラムについて述べたものである。

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A general beam theory is developed capable of treating elasto-plastic bending behavior of steel structures subjected to (a) incrementary load and (b) repeated load combined with axial load ; Attention is focused on the evaluation of the effects of residual stress and finite deformation.
Extended complementary energy method is employed throughout the analysis and numerical results are presented for stress, curvature and deflection of steel members with rectangular and I-sections of the structures.
Problems of plastic stability are also considered theoretically from the same energy viewpoint.

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A method is presented for a large strain elastic-plastic analysis by the finite element method. The constitutive equations of elastic-plastic bodies can be obtained as the incremental relations between stress and strain. Thus, the finite element formulations result in the incremental relations between displacement and external load. In order to compute the incremental equations, several techniques hay to be introduced.

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