Abstract
In two-dimensional problem, an elasto-plastic body which has coefficients E_p, ν_p corresponding to E, ν of homogineous elastic body is derived from orthogonally anisotropic body, where E_p, ν_p are represented by the function of stree-strain state. Substitutig the elasto-plastic body for concrete, elastic-plastic analysis of concrete structure is shown by using the finite element method. Effects of the elastic strain energy of the broken element were considered into the calculation replacing the internal stress to be release to node forces of the element. As an example, numerical result and experiment of the simply supported reinforced concrete beam to be subjected to the concentrated load were discussed, and desirable correspondence was shown for deformation, ultimate load and cracks, especially for tendency of tri-linear characteristic of the load-deformation curve. Moreover, change of the mechanism of equilibrium for the model after cracking is obtained by the numerical method.
