A concrete elasto-plastic constitutive model based on strain space

The constitutive model selected is the key to numerical analysis, which affects the reliability of analysis results directly. It is easy to use strain space plastic model to simulate softening constitutive behavior if the concrete material is beyond its limit stress. In this paper, an elastic-plastic constitutive model is established based on strain space plastic model, using Huang Kezhi-Zhang Yuangao’s three-parameters yield criterion to determine yield surface. The relationship between three parameters of yield criterion and uniaxial compression strength design value of concrete is presented. Using ABAQUS user material subroutine UMAT, the first derivation continuous equivalent uniaxial stress-strain curve is applied. The comparison between test results and calculation results demonstrates that the proposed model has a high calculation accuracy.