A New Constitutional Model for Concrete Materials under Uniaxial Tensive Loading

There are many various stress-strain curves for concrete materials subjected to monotonic tensive loading.Based on the hypothesis of strain equivalence and theory of damage mechanics,a elastoplastic damage constitutive model of concrete under uniaxial tension is established.Existing stress-strain relation of concrete under the loading can be deduced from the model.The stiffness degradation and plastic strain can be shown in the model.The function of damage and plasticity strain is given,and the coefficients used in the model can be determined by the condition of the curve on the characteristic points and method of optimization.It is found that theoretical curve has a good agreement with experiments′.