Experimental study on the dynamic bond behavior between CFRP and concrete under different slip rates

Abstract

In this paper, a series of single-shear tests were carried out to investigate the bond behavior between carbon FRP (CFRP) and concrete under quasi-static and dynamic loadings. The local bond stress-slip relationship and the ultimate bond strength between CFRP and concrete with different compressive strengths under different slip rates between 1.2 × 10−5 m/s and 9 m/s were derived and compared. Test results showed that the ultimate bond strength, maximum bond stress and slip at maximum bond stress increase with the increase of slip rate, while the effective bond length is not sensitive to the slip rate. Based on the testing data, several empirical formulas were proposed to predict the ultimate bond strength, maximum bond stress and slip at maximum bond stress under different slip rates. A local bond stress-slip model, which incorporates the effect of the slip rate, was also established.