抄録
The design methods of the reinforced concrete staircase composed of either a system of folded plates or a helicoidal shell have been debated in terms of elastic beam theories, exclusive of very few instances of more rational approaches form elastic, elasto-plastic, vibrationary or other theories of plates and shells. To come before discussion of the entitled design procedure in the existing variform cases of both structural types, the report develops such a method of analysis of elasto-plastic behaviors of the relevant R.C. structures as finite element method using laminated elements, for the purpose of finding general design priciples by comparing the analytical with the available experimental results.
