考虑多轴应力状态影响的二维混凝土损伤模型

n two-dimensional damage model accounting for the effect of multi-axial stress state is developed by embedding the yielding function into the damage model proposed by Long Yuchuan and Li Zhengliang. This model is applied to the simulation of Kupfer's concrete test under biaxial stress. The results show that the calculated stress/strain relation is comparable to the experimental one. The peak load obtained with the damage model is consistant with that obtained by the test and the compressive strength under biaxial stress is higher than that under uniaxial one. However, the numercial strain response is different with the experimental one because the evolutive rule of irrecoverable strain used herein is obtained under uniaxial stress. The results indicate that the damage model is applicable to simulate the damage behavoir of concrete under multi-axial stress and a new plastic-damage model should be developed based on the plastic flow theory to account for the influence of multi-axial stress on the evolution of irrecoverable strain.