高性能混凝土三向受压力学性能试验研究  

Experimental study on mechanical properties of high-performance concrete under triaxial compression

作　　者：杨渊 张绮雯 罗松俭 柯晓军[2] YANG Yuan;ZHANG Qiwen;LUO Songjian;KE Xiaojun(The First Construction Engineering Group Co.,Ltd.,of Guangxi Construction,Nanning 530001,China;School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)

机构地区：[1]广西建工第一建筑工程集团有限公司,广西南宁530001 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《混凝土》2024年第2期64-67,共4页Concrete

基　　金：国家自然科学基金(51668007);广西自然科学基金(2018GXNSFAA050007)。

摘　　要：设计了60个不同围压及混凝土强度的高性能混凝土圆柱体试样进行常规三轴受压试验,以研究其在三向应力下的力学性能。结果表明:试件在单、三向受压状态下分别发生纵向劈裂、斜向剪切破坏;试样应力-应变曲线可分为:弹性上升段、塑性上升段、软化下降段。其中,软化下降段比单轴受压状态更平滑,表明延性更高;随着侧向压力的增加,试件弹性模量、峰值应力及峰值应变均显著增大;最后由最小二乘法建立了侧向压力关于峰值应力、峰值应变的计算式。Sixty high performance concrete cylinder specimens with different confining pressures and concrete strengths were designed for conventional triaxial compression tests to study the mechanical properties under triaxial stress.The results showed that longitudinal splitting and oblique shear failure occurred under uniaxial and triaxial compression respectively.The stress-strain curve of specimens could be divided into three stages:elastic rising section,plastic rising section and softening falling section.The softening falling section is smoother than that of uniaxial compression,showing an increase in ductility.With the increase of lateral pressure,the elastic modulus,peak stress and peak strain of specimens increased significantly.Finally,the calculation formula between lateral pressure and peak stress,peak strains were established by the least square method.

关 键 词：高性能混凝土 三轴受压 破坏特征 力学性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]