混凝土双面粘贴碳纤维片材的直剪应力分析  

Theoretic analysis for bond stresses between CFRP and concrete in double shear tests

作　　者：周朝阳[1] 李明[1] 吴志刚[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2004年第2期75-78,共4页Journal of Railway Science and Engineering

基　　金：铁道部科技计划项目 ( 2 0 0 2G0 43 )

摘　　要：近年来 ,采用外部粘贴碳纤维 (CFRP)片材加固混凝土结构的新技术 ,在国际上受到普遍重视且其应用较广。在此项技术中 ,片材与混凝土的粘结至关重要。混凝土双面粘结CFRP的直剪试验用于研究界面粘结应力较为适宜。目前此类试验已逐渐开展 ,但有关应力分析尚未见报道。研究以线弹性理论为基础 ,推导了双面直剪试验中碳纤维片材与混凝土之间的粘结应力理论表达式 ,同时分析了混凝土和碳纤维的应力 ,此外还进行了三维有限元计算 ,并对该理论解加以验证。结果表明 :剪应力沿粘结长度的分布存在应力奇异的现象 ,最大的剪应力出现在粘结界面的端点 ;所得解析解用于计算直剪试验中的粘结应力简便可行 。In recent years, CFRP laminates have been externally bonded to the surfaces of deficient concrete structures for strengthening. Wide attention has been paid to this technique and it is increasingly applied. When the laminate is used to strengthen concrete structures, its bond with concrete is extremely important. The double shear test is suitable for studying the bond stress and was carried out, but the relevant stress analysis has not been reported in research literatures. In this paper, the analytical expression for bond stress between CFRP laminate and concrete is derived on basis of the linear elastic theory. The results indicate stress concentration at the end of CFRP where the largest shear stress appears. The solution is then verified by finite element analysis, and therefore, can be used to theoretically solve the bond question in the shear test.

关 键 词：混凝土 双面粘贴碳纤维片材 直剪应力 粘结界面 

分 类 号：TU377.94[建筑科学—结构工程]