双向荷载下混凝土的破坏机理研究  

Research on the damage mechanism of concrete under biaxial compression

作　　者：张敏霞[1] 徐平[1] 丰晓灿 王有凯[1] 冯超元 

机构地区：[1]河南理工大学土木工程学院,河南焦作454000

出　　处：《工业建筑》2013年第S1期613-616,共4页Industrial Construction

基　　金：河南省教育厅自然科学基金(2011A560004);河南省高等学校深部矿井建设重点学科开放实验室开放基金(2011KF-09);河南理工大学博士基金;河南理工大学青年基金(2013-09A)

摘　　要：为了研究不同加载条件下的混凝土力学特性与破坏机理,利用河南理工大学的双向加载试验机,对混凝土进行双向压缩试验。通过试验对比分析发现,双轴压缩混凝土的破坏现象与单轴压缩破坏不同,混凝土的破坏属于剪切破坏,而双轴压缩混凝土的破坏属于拉-剪破坏;双轴压缩混凝土的应力应变曲线可分为三阶段,且双轴1:1压缩强度较双轴2:1高,双轴2:1压缩强度比单轴压缩高,可见中间主应力对混凝土有显著的影响。In order to study mechanical characters and failure mechanism of the concrete under biaxial compression,the biaxial compression test of concrete is carried out,using isotropic biaxial loading system of Henan Polytechnic University.By the experimentit has been found that the failure of the concrete is different from that of the concrete under uniaxial compression.The failure of the concrete under uniaxial compression is shear failure and the failure of the concrete under biaxial compression is tension-shear failure.The biaxial compression stress-strain curves of concrete under uniaxial compression can be divided into three stages.The strength of 1 ∶ 1 biaxial compression is higher than that of 2∶ 1 biaxial compression,and the strength 2∶ 1 biaxial compression strength is higher than that of the uniaxial compression,showing that the intermediate principal stress hase a significant impact on the concrete.

关 键 词：混凝土 单轴压缩 双轴压缩 破坏机理 力学特性 

分 类 号：TU528[建筑科学—建筑技术科学]