CFRP筋及其加筋混凝土梁感知性能试验与分析  

Experimental research on sensing properties of CFRP bar and concrete beams reinforced with CFRP bars

作　　者：王勃[1] 欧进萍[2] 张新越[2] 何政[2] 

机构地区：[1]吉林建筑工程学院土木工程学院,长春130021 [2]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2007年第2期220-224,共5页Journal of Harbin Institute of Technology

基　　金：建设部研究开发项目(06-k1-25);中国博士后科学基金资助项目(20060390802);黑龙江省博士后资助经费(LBH-Z05123)

摘　　要：对14个CFRP筋试件进行受拉试验,试验采集(carbon fiber reinforced polymer)CFRP筋的应力、应变和电阻值,基于压阻效应CFRP筋电阻随拉应变增加而增加.当CFRP筋破坏时其电阻变化率为31%-64%,直径4 mm和6 mm的CFRP筋应变敏感系数分别是30.5和38.6,是普通电阻应变片灵敏系数的13.80倍和17.47倍.CFRP筋电阻变化主要是由于电阻率变化引起的,碳纤维的弹性变形引起的电阻变化很小.对6根CFRP加筋混凝土梁进行三分点静力加载试验,试验记录了梁中CFRP筋电阻随梁跨中变形增加的变化曲线.当混凝土梁破坏时CFRP筋电阻变化率为2.54%-6.87%.试验研究表明CFRP筋既可用作混凝土结构的受力筋,又可用作传感器进行结构健康监测.The stress, strain and electrical resistance of fourteen （carbon fiber reinforced polymer） CFRP bar specimens are recorded under tensile load. The electrical resistance of CFRP bar increases with tensile strain using the piezoresistive effect. The electrical resistance change of CFRP bar is about 31% - 64% when CFRP bar fractures. The sensibility factor is 30. 5 and 38. 6 respectively, 13. 80 and 17. 47 times as that of strain gauge for the diameter of 4 and 6 mm respectively. The electrical resistance change of CFRP bar is caused by resistivity change. The elastic deformation of carbon fibers has little effect on the electrical resistance change of CFRP bar. Six concrete beams reinforced with CFRP bars are tested to failure under third -point static loading. The curves of electrical resistance change of CFRP bar in concrete beams versus mid - span deflection are presented. The electrical resistance change of CFRP bar is about 2. 54% -6. 87% at concrete beam failure. The test results show that CFRP bar can be used as both reinforcement and sensors for the structural health monitoring in concrete structures.

关 键 词：CFRP筋 感知 混凝土 梁 

分 类 号：TU375[建筑科学—结构工程] TU599