Abstract
To assess analytically and properly the impact resistance and safety of RC structures against impact loads, it should be required to employ the dynamic constitutive model of concrete that involves tri-axial stress states for computer codes. This study is to present the dynamic and tri-axial constitutive model of concrete with strain softening behavior. Thus, the tri-axial and rapid loading tests for cylindrical concrete specimens are executed. In tests, the number of confining aluminum rings and the loading rates are chosen as test parameters. Based on test results, the effects of these parameters on the strain localization and the strain softening behaviors of concrete are examined and the orthogonal anisotropic constitutive model is proposed.
