Shear strengthening of t-beams with corroded stirrups using composites

Tamer El-Maaddawy, Yousef Chekfeh

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The test results of 12 concrete T-beams with corroded stirrups strengthened in shear with externally bonded carbon fiberreinforced polymer (EB-FRP) sheets and near-surface-mounted (NSM) glass fiber-reinforced polymer (GFRP) reinforcing bars are reported in this paper. The test parameters included the level of corrosion damage in the stirrups, shear-strengthening system, and fiber-reinforced polymer (FRP) shear reinforcement ratio. The reduction in shear capacity caused by corrosion of the stirrups was proportional to the reduction in the stirrups' cross-sectional area. For the beams with a corrosion damage state of 8% cross-sectional loss in the stirrups, both shear-strengthening systems restored the shear capacity. For the beams with a corrosion damage state of 15% cross-sectional loss in the stirrups, only the higher amounts of FRP shear reinforcement in both systems could restore the shear capacity. The interaction between the level of corrosion in the stirrups, amount of FRP, failure mode, and shear strength gain was elucidated. The experimental results were compared with the predictions of published analytical models.

Original languageEnglish
Pages (from-to)779-789
Number of pages11
JournalACI Structural Journal
Volume110
Issue number5
Publication statusPublished - Jan 1 2013

Keywords

  • Corrosion
  • Fiber-reinforced polymer composites
  • Shear
  • Stirrups
  • Strengthening

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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