Abstract
Externally bonded (EB) fiber-reinforced polymer (FRP) systems and mechanically fastened (MF) FRP strips can both be used to strengthen reinforced concrete (RC) structures, but each has some drawbacks. This paper proposes a new technique for the flexural strengthening of RC beams that combines the EB and MF FRP systems. The technique uses nylon anchors inserted inside the concrete prior to installing the fasteners. These anchors provide a better grasp of the fasteners with the concrete. The hybrid EB/MF-FRP-strengthened specimens showed higher load capacity and post-cracking stiffness than those of the corresponding MF-FRP counterparts. Extending the FRP strips for the entire beam span is necessary for achieving the noticeable enhancement of the load capacity and stiffness with this hybrid EB/MF-FRP system. The failure of the strengthened beams in the system is associated with diagonal cracks at the strip end locations due to fastener rotation and bearing damage.
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