Hybrid shear strengthening system for reinforced concrete beams: An experimental study

Usama Ebead, Huda Saeed

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)421-433
Number of pages13
JournalEngineering Structures
Volume49
DOIs
Publication statusPublished - Apr 2013

Keywords

  • Externally bonded FRP
  • Fasteners
  • Hybrid
  • Mechanically fastened FRP
  • Reinforced concrete beams
  • Shear strengthening

ASJC Scopus subject areas

  • Civil and Structural Engineering

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