A PRACTICAL CONFINED CONCRETE CONSTITUTIVE MODEL UNDER UNIAXIAL HYSTERESIS LOAD

To develop a constitutive model for confined concrete under uniaxial hysteresis load, six kinds of typical models were studied and compared by the use of ABAQUS UMAT. Through the comparison between model calculations and experimental results of these models, the accuracy and computational efficiency of each model were investigated considering three aspects: compression skeleton curve, compression hysteresis curve, and tension hysteresis curve. Finally, a practical concrete uniaxial constitutive model for hysteretic loading was developed, which is capable of considering complex loading paths by using Mander model in compression skeleton, proposed model in compression range of hysteresis curve and Teng-Zou mode in tension range hysteresis curve.