Abstract
A smeared crack approach to fracture of concrete is implemented in the finite element program ADINA. Non-linear concrete elements with tensile cracking are modified to include tensile strain softening. Upon cracking of an element at an integration point, the stiffness perpendicular to the crack is reduced to zero and the tensile stress across it is set as a function of the crack opening. Equilibrium iterations are implemented to redistribute stress. Two and three dimensional models of a single edge notched beam in three point bending are analysed and compared to experimental results. In the three dimensional model the crack front appears slightly curved, not as deep near the free edges as in the center.
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