A non-linear rheological model which was proposed by the authors mainly for the behavior of a brittle material in compression is slightly modified and extended to tensile stress field. This constitutive equation can be applicable to the post-failure region / behavior of steel-fiber reinforced mortar in tensile stress field. The one-dimensional simulation results indicate that the stress decreases more rapidly in the post-failure region as length of a test piece increases.
The constitutive equation is implemented to a FEM program and 4-points bending test is simulated. Calculated results of ultimate strength, absorbed energy and load-deflection curve reasonably coincide with the experimental ones.
