Subloading Surface Model For Concrete Under Cyclic Loading Conditions

Currently, the studies on constitutive models of concrete are relatively developed. On the contrary, those models which are available for cyclic loading remain to be studied due to their difficulties of modeling. In this paper, a new constitutive model of concrete which can be used in cyclic loading was proposed. There have been no relevant references studying concrete mechanical behavior with sub-loading theory before.For this new model, two types of loading methods including4loading paths were used: one is cyclic loading based on deviatoric plane; the other is proportionally cyclic loading with fixed stress ratio along three axes. In order to be compared with experiment results, the model was compiled into Fortran program. When loading on deviatoric plane, stress-strain relationships in the deviatoric space, both from the model and the experiment, are in a good agreement; however, it shown certain differences in the spherical space. For stress-strain curves in proportionally cyclic loading, a good correlation of model and tests occurred in the transcending stage but not in the descending stage. This model is also feasible for simulating the massing effect and the ratcheting effect.