Recent experimental results of the FRP–concrete bonded joint using flexible adhesive showed that the
most popular analytical models available in the literature underestimate the bond strength and the effective bond length of these experiments. Most of these existing models need to be modified to consider the type of adhesive layer. Consequently, the bond strength model proposed by Chen and Teng (2001) has
been modified to consider the type of adhesive layer. An extensive database consisting of about 100 test
results of FRP–concrete joint has been assembled to examine the validity of the proposed model taking
the type of adhesive layer into consideration. The modified bond strength model is accurately capable of
predicting the bond strength and the effective bond length.