Abstract
This study uses experimental tests and finite element modeling to investigate the interfacial behavior between mechanically fastened (MF)-fiber reinforced polymer (FRP) composite and concrete substrates. A total of 23 direct shear tests were conducted on FRP strips MF to concrete. Based on the experimental results of one fastener FRP/concrete connection, bearing-slip models are developed to address the MF-FRP/concrete interfacial behavior. Finite element models are then presented to address the interfacial behavior between the FRP strips and the concrete substrate for both the MF-FRP/concrete direct shear specimens, as well as for MF-FRP-strengthened reinforced concrete beams. Results are presented in terms of ultimate load capacities, load-slip relationships, and strain distributions along the FRP strip. Good agreement is obtained between the numerical predictions and experimental data in terms of ultimate carrying capacities, failure modes and load-deflection relationships.
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