混凝土三轴抗压强度尺寸效应试验研究  

Experimental study on size effect of concrete triaxial compressive strength

作　　者：苏捷[1] 莫衍 刘伟 SU Jie;MO Yan;LIU Wei(College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院

出　　处：《铁道科学与工程学报》2020年第2期358-363,共6页Journal of Railway Science and Engineering

基　　金：国际自然科学基金资助项目(51408213);国家重点研发计划项目(2018YFC0705405)

摘　　要：为研究混凝土三轴抗压强度的尺寸效应,对84个混凝土立方体试件进行加载应力比分别为0.00:0.00:1,0.05:0.05:1,0.10:0.10:1,0.15:0.15:1和0.20:0.20:1的三轴受压试验,分析三轴抗压强度的尺寸效应。试验结果表明:在各加载应力比下,混凝土试件的三轴抗压强度均存在尺寸效应现象;试件的三轴抗压强度随应力比的增大成倍的增长;随加载应力比的增大试件三轴抗压强度尺寸效应现象越来越不明显;三轴受压时试件有2种破坏形式,当应力比在0.00:0.00:1~0.15:0.15:1之间时发生柱状劈裂破坏,当应力比为0.20:0.20:1时,发生挤压流变破坏。In order to study the size effect of triaxial compressive strength of concrete, the triaxial compression tests with loading stress ratios of 0.00:0.00:1, 0.05:0.05:1, 0.10:0.10:1, 0.15:0.15:1 and 0.20:0.20:1 were carried out on 84 cubic concrete specimens. The results show that the triaxial compressive strength of concrete exhibits size effect under different loading stress ratios. The triaxial compressive strength increases exponentially with the increase of stress ratio, and the size effect becomes less obvious. Also, there were two failure modes of the specimens under triaxial compression. Columnar splitting failure occurs when the stress ratio was between 0.00:0.00:1 and 0.15:0.15:1, and extrusion rheological failure occurs when the stress ratio was 0.20:0.20:1.

关 键 词：混凝土 尺寸效应 加载应力比 三轴抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]