不同应变速率下混凝土圆柱体劈拉性能试验研究  

Experimental Research on Splitting Tensile Performance of Concrete Cylinder under Different Strain Rate

作　　者：王孝政[1] 马小亮[1] 邓媛[1] 刘博文[1] 罗曦[1] 

机构地区：[1]三峡大学土木与建筑学院,443002

出　　处：《灾害与防治工程》2015年第2期51-57,共7页Disaster and Control Engineering

摘　　要：通过对尺寸为φ150×150mm混凝土试件在不同加载方式（轴向加载、径向加载）、不同应变速率（10^-5／s、10^-4／s、10^-3／s、10^-2／s）下的劈拉试验，研究了混凝土力学性能随应变速率变化的规律，研究结果表明：混凝土劈拉强度随着应变速率的增加而增大；径向加载时，混凝土的劈拉强度比轴向加载时混凝土的劈拉强度高；轴向加载时混凝土的劈拉强度对应变速率更为敏感，混凝土的动态劈拉强度与应变速率的对数成近似线性关系；混凝土劈拉过程吸能能力随着应变速率的增大而增加；轴向加载时，混凝土的吸能能力对应变率更敏感；与理论对比分析，径向加载曲线拟合精度更高；通过试验验证，改进的Mazars模型能很好地描述混凝土劈拉本构关系。Splitting tensile tests for concrete of size φ150 ×150mm were carried out under different strain rates（10^-5/s、 10^-4/s、10^-3/s、 10^-2/s） and different conditions （axial load, radial load）. Mechanical properties of concrete changes with strain rate are researched, the research results show that： the splitting tensile strength of concrete increases with strain rates, and the radial splitting tensile strength of concrete is higher than that of axial strength~ splitting tensile strength of axial load is more sensitive to strain rate; dynamic splitting tensile strength of concrete and the logarithm of strain rate shows approximately linear relationship; concrete splitting tensile energy absorption capability increases with strain rate; when the axial load, energy absorption capacity of concrete is more sensitive to strata rate; concrete arithm of strain rate i Mazars model fits the dynamic splitting tensile energ s approximately linear relations concrete split constitutive laws y absorption capability and the log- hip; through the test, the improved well.

关 键 词：混凝土 劈拉 应变速率 吸能能力 

分 类 号：TU755.7[建筑科学—建筑技术科学]