摘要
针对混凝土结构在使用过程中经常会遭遇动荷载作用且作为一种率敏感性材料的动态力学性能将直接影响结构的承载力问题,从细观层次出发,结合试验实测的混凝土各组分静动态应力—应变曲线,拟合了混凝土各组分不同应变率下的本构模型,采用自主开发的混凝土非线性有限元软件,对混凝土试件轴拉试验细观数值进行了仿真,探讨了混凝土抗拉强度、弹性模量随应变率的变化规律。结果表明,混凝土抗拉强度和弹性模量均随应变率的增加而增加,但弹性模量的率敏感性低于抗拉强度的率敏感性,且计算结果与试验结果相吻合。
Concrete structures are usually under dynamic load in the service period. However, concrete is a rate sensi- tive material and the bearing capacity of concrete structures under dynamic load is depended on the dynamic mechanical properties. In this paper, the constitutive models of aggregate, mortar and interface were put forward based on static-dy- namic stress-strain curves in test. Then the tensile strength and the elastic modulus of concrete under different dynamic axial tension were simulated. Finally, the tensile strength and the elastic modulus of concrete with different strain rate were discussed. It is shown that the tensile strength and the elastic modulus of concrete increase with the strain rate adding, and the effect of strain rate on the tensile strength is more significant than that of the elastic modulus. The calcu- lation results are consistent with the test.
出处
《水电能源科学》
北大核心
2013年第3期99-102,共4页
Water Resources and Power
基金
中国水利水电科学研究院开放研究基金资助项目(IWHRK2010014)
河海大学中央高校基本科研业务费基金资助项目(2010B04314)
关键词
混凝土
应变率效应
细观仿真
抗拉强度
弹性模量
concrete
effect of strain rate
micro simulation
tensile strengthl elastic modulus