考虑应变率效应的混凝土疲劳损伤本构模型

基于边界面概念和连续损伤力学理论,建立了由应变控制的混凝土拉、压疲劳损伤本构模型.在此基础上,通过对应变能释放率Perzyna黏性规则化来考虑混凝土的应变率效应,从而获得了可以研究材料静力、动力和疲劳特性的统一混凝土疲劳损伤本构模型,并用C＋＋语言编程对考虑应变率效应的混凝土本构关系和试验实例进行了计算和比较,结果表明该模型能较好地模拟混凝土应变率效应.

Damage constitutive model of concrete for fatigue loading considering rate effect

Based on the concept of boundary surface and continuum damage mechanics,a damage constitutive model was built,which was controlled by strain and could analyze fatigue characteristics of concrete.When the strain-rate effect was considered with Perzyna viscous regularization of strain-energy releasing rate in the above model,a general damage constitutive model was achieved for concrete under static,dynamic or fatigue loading.Through compiling program in C++ language according to this model,and the strain-rate effect of concrete was simulated with the numerical method and compared with those numerical and experimental results in a reference.The results show that the damage constitutive model can simulate strain-rate effect of concrete well.