Abstract
In this paper, the standardization on the tension softening diagram of concrete was investigated. According to the survey of recent studies, the evaluation methods of tension softening diagram were classified into some groups and their characteristics were mentioned. From the data of experiments on the fracture test of concrete, the relationship of the predicted bilinear parameter and mechanical properties was analyzed. Especially, the problem of the CEB-FIP model code 1990 which is specifying the bilinear type tension softening curve was pointed out, and the modified simple bilinear prediction method was proposed and the efficiency of it was discussed.
