| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 267187 | Engineering Structures | 2013 | 13 Pages |
This research mainly investigates the efficacy of the mechanically fastened fiber reinforced polymer (MF-FRP) and the hybrid externally bonded/mechanically fastened FRP (EB/MF-FRP) strengthening systems for beam shear strengthening as compared to the well-established EB-FRP counterpart. The results of twenty-one (21) beam specimens categorized into four types, namely, reference specimens, EB-FRP, MF-FRP-FRP and hybrid EB/MF-FRP strengthened specimens are reported. The work presented is part of a research campaign on the use of the newly developed MF-FRP and EB/MF-FRP strengthening systems. A comprehensive study is presented on the effect of using the MF-FRP and the hybrid EB/MF FRP strengthening systems on the modes of failure of the strengthened beams. Utilizing the MF- and hybrid EB/MF-FRP strengthening systems aims mainly to avoid the debonding type of failure that is often experienced when using externally side bonded FRP strips. The effect of the interaction between the external strengthening strips and the internal transverse steel reinforcement on the shear capacity of the beams is qualitatively assessed for the EB-, MF-, and hybrid EB/MF-FRP strengthening systems. This has been achieved by testing specimens with and without transverse steel reinforcement within the critical shear span. Moreover, different parameters have been assessed through utilizing wide versus narrow and vertical versus inclined FRP strips in addition to utilizing two different patterns of fasteners for the MF- and the hybrid EB/MF-FRP strengthening systems.
► The hybrid EB/MF-FRP strengthening technique is examined for beam shear strengthening. ► The EB/MF-FRP strengthened beams showed higher capacities vs. those of the EB-FRP counterparts. ► The hybrid system can mitigate the shear and strip debonding types of failure of beams. ► The ductility of the beams can be improved as shear failure can be totally mitigated. ► External/internal shear reinforcement interaction effect on the shear capacity is assessed.
