中文摘要：

CFRP的剥离是抗弯加固钢筋混凝土梁经常会出现一种早期破坏模式，这种破坏主要是由于裂缝基部附近的界面剪应力与正应力所造成。通过8根碳纤维板材抗弯加固钢筋混凝土梁的试验，主要研究裂缝基部纤维片材发生剥离时的界面剪应力。研究结果表明：在跨中等弯矩区，受拉区垂直裂缝的发生，导致裂缝基部的CFRP与混凝土间产生界面剪应力而剥离，其剪应力分布类似于钢筋与混凝土之间的锚固黏结应力分布，且最大剪应力位置逐步向远离裂缝转移的过程大致与CFRP剥离过程相一致，剪应力最大值与纤维层数、混凝土强度有关。

英文摘要：

Debonding of CFRP is a main premature failure of RC members strengthened by means of externally bonded plate, which is mainly due to both shear and normal stress induced near crack.By the experiment of 8 RC beam strengthened with CFRP,the interfacial shear stress is studied.The results of research show that in the constant moment region at mid-span, vertical flexural cracks led to the debonding between CFRP and concrete substrate because of the interfacial shear stress,whose distribution pattern was similar to that of bond-anchorage stress.The distribu- tion region of maximum interracial shear is similar to the debonding extending of CFRP.The main influence parameters on the maximum interfa- cial shear stress include the amount of FRP and the concrete strength.