Analysis of Influencing Factor on Bond Strength for Glass Fibre Reinforced Polymer(GFRP) Anchor

Through the investigation and analysis on the direct pullout and beam experiments of GFRP rebars at home and abroad,the effect of the rebar surface shape,rebar surface texture,rebar diameter,rebar embedment length,concrete strength and environment on the bond strength between GFRP rebar and concrete were analyzed,the relative merits and applications conditions of the models for the bond strength-slip curve and the formula of bond length were pointed out.The analysis shows that ①at first,the bond sthength increases with the enhance of rib spacing and rib height,and then the bond sthength decreases with the enhance of rib spacing and rib height and the bond sthength increases with the enhance of the rib width and concrete strength and decreases with the enhance of the embedment length and the degradation of environment,②at present,there is no standards on the test methods and test spacimen and there is lack of numerous expremental datas to support the research.