机敏混凝土三向受压时的应变电阻效应研究  

Study on Strain Resistance Effect of Smart Concrete Under Triaxial Compression

作　　者：郑立霞[1] 李卓球[1] 宋显辉[1] 张小玉[1] 

机构地区：[1]武汉理工大学理学院,湖北武汉430070

出　　处：《四川大学学报（工程科学版）》2013年第2期33-37,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：中央高校基本科研业务费专项资金资助项目(2012-Ia-038)

摘　　要：机敏混凝土具有优良的应变电阻敏感性,可将其制成传感器,用于对土木工程结构的健康监测。当其埋入大体积混凝土结构中时,往往处于三向受力状态。研究了机敏混凝土试样在三向受压情况下的应变电阻效应,并与单向受压时的结果进行比较。结果表明:在弹性阶段,轴向电阻随着轴压的增大而减小,随着围压的增大而增大;轴向应变是引起试样轴向电阻变化的直接和根本原因,不管其它量如何变化,只要影响轴向应变,轴向电阻就会相应地发生变化;同单向受压时相比,试样三向受压时电阻的变化也有3个阶段:可逆感应阶段、平衡阶段和剧增阶段,但可逆感应阶段和平衡阶段相对较长,且三向受压时试样应变电阻灵敏系数有所降低,但线性更好。The strain resistance effect of smart concrete under triaxial compression was studied,and compared with the result measured under uniaxial compression.The results showed that during elastic stage of deformation,the axial resistance decreases with the increase of axial load,while it increases with the increase of confining pressure.The axial strain is the direct and fundamental cause for the change of axial resistance.Comparing with uniaxial compression,the change of axial resistance also has three stages under triaxial compression： reversible induction stage,balance stage and rapid increase stage,but the reversible induction stage and balance stage are relatively long.The gauge factor of smart concrete under triaxial compression decreases,but owns better linearity.

关 键 词：机敏混凝土 三向受压 应变电阻效应 

分 类 号：TU528.5[建筑科学—建筑技术科学]