Abstract
The process to failure of reinforced concrete members subjected to axial force, bending moment and shearing force is examined by utilizing the finite element method. This paper deals with the theory of nonlinear analysis of reinforced concrete members and mainly describes the analytical procedures for material nonlinearity of concrete including cracks. The following assumptions are made in the analysis : 1) The fracture surface of concrete consists of both ductile and brittle fracture surfaces. 2) The yield surface is similar to the ductile fracture surface. 3) A crack of concrete occurs at the brittle fracture surface. 4) The direction of the crack is perpendicular to that of the maximum principal stress. 5) The concept of plastic potential can be applied to the concrete in plastic region. 6) The concrete near cracks is equivalent to the orthotropic material.
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