Influence of FRP width on bond strength of FRP-to-concrete

Nowadays fiber reinforced polymer (FRP) composites are increasingly used for strengthening of concrete structures. It is evident that the maximum transmittable force from FRP reinforcement to concrete substrate, namedas bond strength, greatly affects all the strengthening calculations. Bond strength of externally bonded reinforcement (EBR) FRP systems to concrete substrate is a function of FRP material characteristics, and concrete strength.Although numerous studies have been conducted on the issue, less attention has been paid to the influence of FRP reinforcement width in the form of bf /bc (bc is width of concrete element) on bond strength of EBR joints.Consequently, the main intention of the current study is to experimentally investigate the aforementioned issue. To do so, single lap-shear tests were conducted on eight EBR FRP-to-concrete joints, prepared using two different FRPwidths and thicknesses. Experimental results are comprehensively discussed and a detailed comparison with ACI 440.2R-08 model predictions is made.

کلیدواژه ها:

bond strength ، externally bonded reinforcement (EBR) ، single lap-shear test ، fiber reinforced polymer (FRP)