Analysis of Dynamic Damage Constitutive Model for Concrete Exposed to High Temperature

To fill a gap in the field of dynamic constitutive model research of concrete, a dynamic damage constitutive model for concrete was established based on a nonlinear viscoelastic constitutive model and damage mechanics, while considering the effect of damage on the mechanical properties of the material. The proposed dynamic damage constitutive model contained nine parameters such as material parameters and modulus of elasticity. High temperature is considered to directly influence the material parameters of the model, and these model parameters were obtained for various temperatures by fitting the experimental stress-strain curves. The comparison of stress-strain curves between the model predictions and experimental results shows that the error of peak stress, peak strain, and modulus of elasticity is less than 5%, 9%, and 7%, respectively, and the fitting similarities are greater than 0.93. Consequently, the model can be used to simulate the mechanical behavior of concrete after exposure to high temperatures.