Hysteretic model of reinforcement based on clough constitutive model and considering strength

In the quasi-static hysteretic simulation of cast-in-situ joints, the clough constitutive model is often used to solve the pinch phenomenon of hysteretic curves caused by bond slip. In this paper, a modified clough constitutive model considering the ultimate strength of the material is proposed. The constitutive model is divided into four sections: elastic section, hardening section, ideal plastic section and degradation section, the ultimate strength of the material itself can be considered in the ideal plastic section, so that the material stress does not exceed the ultimate strength in the numerical simulation. Based on this, the reinforcement hysteretic constitutive model is formed, and the UMAT subroutine of fiber element is compiled. Three examples are verified by ABAQUS platform. The results show that the simulated hysteretic curve has pinch phenomenon, which is in good agreement with the test curve, and the energy consumption and ductility are also similar to the test, so it can be applied to practical engineering.