AN ANISOTROPIC DAMAGE MODEL FOR PLAIN CONCRETE

A two-dimensional damage model is developed for concrete in uniaxial and biaxial tension up to the ultimate load. The model is based on the concept of the equivalence of complementary strain energies. Existing uniaxial and biaxial tension test data are used to establish the evolution of the damage parameters. It is shown that the latter predict accurately not only uniaxial and biaxial tension data but also flexural data from unrelated tests. It is further shown that, whereas the stresses/strains at first cracking and at or near ultimate load in tension and flexure are very different, the accumulated damage according to this model is not. © 1990.