An Isotropy Damage Model for Concrete in Strain Space

Concrete exhibits significant strain softening beyond the peak or initial failure stress and the failure criterion of concrete is not easy determined under complex stresses state. To incorporate this behavior and also reflect the entire failure process, two advancements of Mazars isotropy damage model in strain space have been proposed. To reflect the failure criterion of concrete under multiaxial stresses, based on the idea of Hsieh-Ting-Chen strength failure criterion in stress space, a new four-parameter failure criterion in strain space is presented. Two numerical examples are used to explain the ideas proposed in this paper and compared with experimental data. The results of computation were generally in good agreement with the experimental observations. It is showed from the computed results that the criterion and equivalent strain presented in this paper is reasonable.