A simple elasto-plastic constitutive model of concrete

To understand the concrete behavior in nuclear plants is important because of safety issues regarding possible exposure of concrete to severe environments. A good constitutive model is necessary for the accurate estimation for such cases. In this study, four elastic-plastic models, two of which are taken from the literatures and the others are proposed, are examined through comparisons with biaxial and triaxial test results. In the former two models, identical functional form which involves four or five material constants is used for both the loading and failure surfaces. The third model uses simple von Mises loading function with an independent failure criterion. In the last model, one more loading function is added to the third model to represent the plastic volume change. The proposed two models give good prediction in spite of those simplicity, while the others do not in several cases