抗剪加固FRP与混凝土界面粘结性能的试验研究  

BOND BEHAVIOR BETWEEN SHEAR STRENGTHENING FRP AND CONCRETE: AN EXPERIMENTAL STUDY

作　　者：陈光明[1] 刘迪[1] 李云雷[1] 李世伟[1] 陈建飞[1,2] 许浩彬 

机构地区：[1]广东工业大学土木与交通工程学院,广州510006 [2]贝尔法斯特女王大学建筑规划与土木工程学院

出　　处：《工程力学》2015年第7期164-175,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(51108097;51378130);广东省自然科学基金项目(S2013010013293);广东省高校优秀青年教师科研项目(Yq2013056);广东工业大学校级大学生创新创业训练项目(xj201311845052)

摘　　要：为了深入理解抗剪加固FRP与混凝土界面的粘结性能,该文对侧面粘贴FRP的21根预置裂缝小梁进行了试验研究。试验设计考虑了FRP粘结长度、宽度、厚度及FRP纤维方向与裂缝张开方向的角度(简称"FRP纤维受拉角度",用θ表示)对FRP与混凝土界面粘结性能的影响。试验结果表明:1)所用的预置裂缝小梁可以有效对FRP与混凝土的界面粘结性能进行试验研究;2)FRP粘结长度、宽度、厚度及纤维受拉角度等因素对粘结强度有明显影响;3)FRP应变沿宽度方向的分布是不均匀的,这主要是由于裂缝不均匀开展导致FRP在裂缝开展快的一边先剥离。In this study, 21 small beam specimens with a pre-set through-crack were tested with FRP strips bonded to the sides to study the bond behavior between shear-strengthening FRP and concrete （referred to as ＂the interface＂ for simplicity hereafter）. The test parameters included the bond length, width, thickness of FRP strip and the angle between fiber orientation and crack opening direction （referred to as ＂fiber tensile angle＂ 0 hereafter） on the bond behavior of the interface. Test results showed that： 1） the small beam test setup with a pre-set crack is suitable for studying the bond behavior between FRP and concrete; 2） the bond length, width, and thickness of the FRP as well as the fiber angle have significant effects on the bond strength; 3） the distribution of FRP strains along the direction perpendicular to the fiber orientation （FRP width direction） is non-uniform; this is mainly attributed to the progressive debonding of the FRP strips in the width direction, with the FRP at the location of larger crack width debonding earlier.

关 键 词：混凝土 FRP 界面粘结 纤维受拉角度 剥离 抗剪加固 

分 类 号：TU375[建筑科学—结构工程]