To investigate the effect of surface groove method on the interfacial shear behavior of CFRP-concrete

a series of simple shear tests on CFRP-concrete specimens with surface groove method were carried out

focusing on the effects of groove width-depth ratio (0.5

1.0 and 1.5) and groove shape (rectangle

normal trapezoid and inverted trapezoid) on the interfacial shear behavior of CFRP-concrete

especially the failure modes

fracture energy

and average shear stress. The bond interfacial shear design method of surface groove was proposed. The results show that the failure mode of surface groove method is changed from classⅡdebonding failure to class Ⅵ fracture failure

with the interfacial fracture energy increased by 136.4%

giving a full play to the tensile strength and utilization ratio of CFRP sheets. Furthermore

the groove width-depth ratio is positively correlated with the average shear stress

presenting an optimum volume

and with the average shear stress of normal trapezoidal groove improved

10.1% and 11.8% higher than that of the inverted trapezoidal groove and rectangular groove respectively. As the surface groove method performs better shear behavior

the proposed method can be used to guide the shear design of bonding interface.