定侧压下混凝土双轴动态受压试验研究  

An Experimental Study of Concrete under Dynamic Biaxial Loading with Constant Confinement

作　　者：梁春华[1] 郑金城[1] 周寒清[1] 陈伟[1] 彭刚[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《中国农村水利水电》2013年第2期98-100,共3页China Rural Water and Hydropower

摘　　要：利用大型电液伺服多功能动静力三轴仪对边长为300mm的立方体混凝土试件进行了4种侧应力(单轴准静态抗压强度fc的0、6%、12%、18%)和3种应变速率(10-5/s、10-4/s、10-3/s)下的双轴压试验,探讨了不同侧应力和不同加载速率下混凝土的强度特性和变形特性。研究结果表明:侧应力的变化对混凝土的抗压强度和变形影响很大,各侧应力下的最大影响幅值分别达56.53%和99.60%;相对而言,应变速率对混凝土的抗压强度和变形影响效果要弱,各应变速率下的最大影响幅值分别达6.28%和30.17%;随侧应力和应变速率的提高,混凝土的刚度逐渐增强。Biaxial pressure tests on 300 mm cubic specimens are conducted at 4 lateral pressure （0, 6 %, 12 %, 18% of static uniaxial strength ） and 3 strain rates （10 ^-5/s, 10-4/s, 10-3/s） using a servo-hydraulic multiaxial testing machine, explored the strength and deformation properties of concrete under different lateral pressures and strain rates. The research results show that lateral pressures greatly affect the compressive strength and transformation, the maximum influence amplitudes are for 56.53 % and 99.60 % under all lateral pressures, while the strain rates were not so obvious, the maximum influence amplitudes were for 6.28% and 30. 17% in all strain rates; the stiffness of concrete gradually increases with the increasing in lateral pressures and strain rates.

关 键 词：混凝土 定侧压 双轴 应变速率 

分 类 号：TU528[建筑科学—建筑技术科学]