聚合物水泥砂浆-碳纤维网格加固层与混凝土界面的黏结性能试验研究  

Experimental study on bonding behavior of interface between concrete and CFRP grid-PCM

作　　者：郭瑞[1,2] 蔡联亨 潘毅 刘扬良[1] GUO Rui;CAI Lianheng;PAN Yi;LIU Yangliang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Department of Civil Engineering,Kyushu University,Fukuoka 8190395,Japan;Key Laboratory of Seismic Engineering of Siehuan Province,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]九州大学土木工程学院,日本福冈8190395 [3]西南交通大学抗震工程技术四川省重点实验室,四川成都610031

出　　处：《建筑结构学报》2018年第9期167-174,共8页Journal of Building Structures

基　　金：国家重点研发计划(2016YFC0802205,2016YFB0303603-4);国家自然科学基金项目(51108389)

摘　　要：为研究聚合物水泥砂浆（polymer coment mortar,PCM）-碳纤维增强复合（carbon fiber reinforced polymer,CFRP）网格加固层与混凝土界面的黏结滑移关系和应力传递机理,对18个试件进行了拉拔试验,观测了其破坏形态和荷载-滑移关系,分析了CFRP网格的结点数、网格间距和不同类型的PCM对界面的黏结滑移和应力传递的影响。试验结果表明：低弹性PCM变形能力虽优于高强度PCM,但其在受拉过程中由于变形,易产生较大的应力,从而导致混凝土与PCM之间过早产生剥离破坏;CFRP网格在抗拉中起到约束滑移的作用,并随着网格间距的增加,横向网格筋的约束作用越显著;纵向网格筋的应变均呈现出从加载端到自由端逐渐减小的趋势,拉应力通过CFRP网格的结点依次传递给PCM和混凝土,其中第1网格结点的抗拉效果最明显;为使CFRP网格与PCM、混凝土有足够的黏结强度,即网格结点的应变分担率总和达到90%以上,则网格结点至少要3个及以上,且网格结点应随着网格间距的减小而增多。In order to reveal the bonding-slip behavior and stress transfer mechanism of RC members strengthened by carbon fiber reinforced polymer （CFRP） grid with polymer cement mortar （PCM） shotcrete, a total of eighteenth specimens was carried out by bonding strength tests of CFRP grid with number of CFRP grid points, interval of horizontal grid, and existence of vertical grid as parameters. Observed the fracture modes and load-slip relationship of each specimens, analyzing the influence of tests parameters on interface slippage and stress transfer. It shows that the deformation of the low elasticity PCM is better than that of high strength ones, when the tensile force, which transferred from CFRP grid to PCM, exceeds the ultimate bonding stress between concrete and PCM, the peeling damage occurs; the restraint effect of horizontal grid leads to CFRP grid deforming, the effect increases with the interval of grid; the tensile force acting on the CFRP grid is transmitted to the CFRP grid and concrete through PCM, and tensile force to CFRP grid is transmitted by each grid point ; when the number of grid points is three or more, the total strain distribution ratio of CFRP grid is over 90% ,it means the bonding behavior is sufficient, increasing with the interval of grid reduction.

关 键 词：CFRP网格 聚合物水泥砂浆 拉拔试验 黏结性能 应变分担率 网格结点 应力传递 

分 类 号：TU528.572[建筑科学—建筑技术科学]