钢纤维混凝土弹塑性损伤本构模型试验研究  

Experimental Study on Constitutive Model of Elastic-plastic Damage of SFRC

作　　者：梅世强[1] 姜袁[1] 郝景宏[1] 杨克荣[1] 马莉[1] 

机构地区：[1]三峡大学土木与建筑学院,宜昌443002

出　　处：《混凝土与水泥制品》2010年第6期50-52,共3页China Concrete and Cement Products

基　　金：国家自然科学基金项目(50679039);国家自然科学基金重大项目(90510017);中国博士后基金项目(20060390832)

摘　　要：对钢纤维含量为0和3%的混凝土进行了应变速率为10-3的等应变增量重复加卸载试验。结果表明,在相同应变水平时,钢纤维混凝土的累积塑性变形低于普通混凝土。钢纤维混凝土的刚度变化幅度较普通混凝土小,约为0.86倍初始弹性模量,而普通混凝土的约为1.1倍初始弹性模量。依据刚度退化规律,并考虑损伤临界值的影响,得到了关于应变的损伤变量表达式;依据试验结果得到了单轴受压状态下的混凝土全量弹塑性损伤全量本构模型。Equal strain increment cyclic loading and unloading tests with strain rate at 10-3 were carried out for steel fiber reinforced concrete（SFRC） with 0 and 3% respectively.The results show that,at the same strain level,accumulative plastic deformation of SFRC is less than plain concrete.The range of stiffness variation of SFRC is less than plain concrete,which is 0.86 times of the initial elastic modulus for SFRC and 1.1 times for plain concrete.Based on stiffness degradation rules,and considering the effect on damage critical value,the formulas of damage variables for strain are obtained.Through the testing results,constitutive model of uniaxial compressive concrete with the total elastic-plastic damage is obtained.

关 键 词：临界损伤 弹塑性耦合 刚度退化 本构模型 

分 类 号：TU528.572[建筑科学—建筑技术科学]