The damage parameter in ABAQUS Concrete Damaged Plasticity model plays an important role in defining the behavior of reinforced concrete members for that it has remarkable influence on not only the unloading and cyclic loading stiffness of concrete but also the ratio of plastic strains to elastic ones. A number of test data was collected and analyzed. By adopting the data fitting scheme, a new approach of determining the parameter is put forward based on these data. The comparison of the damage parameter attained from this study and those calculated via other formulas as well as a numerical test are conducted. The results reveal that the method is capable of accurately reflecting the material deterioration while remaining its conciseness and applicability comparing with other approaches.
concrete damaged plasticity, ABAQUS, damage parameter, axial test of concrete, curve fitting