Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Sheets with Bonded Anchorage

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Title: Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Sheets with Bonded Anchorage

Author(s): Bimal Babu Adhikary, Hiroshi Mutsuyoshi, and Muhammad Ashraf

Publication: Structural Journal

Volume: 101

Issue: 5

Appears on pages(s): 660-668

Keywords: bond strength; epoxy resin; reinforced concrete; shear strength

Date: 9/1/2004

Abstract:
This paper presents the results of a study into shear strengthening of reinforced concrete (RC) beams using externally bonded fiber-reinforced polymer (FRP) sheets. The study focused on the effect of extending the length of sheet on the top surface of the beam to delay or prevent sheet debonding. Test variables were the kinds of fibers, the wrapping layouts, and the length of bonded anchorage. From the experiments, it was confirmed that FRP with bonded anchorage is much more effective than the U-wrap scheme. Extending the sheets on a top surface of the beam resulted in a decrease in interface bond stresses and an increase in FRP strain at failure. Four different models for estimating the contribution of FRP sheets to the shear capacity Vf of beams were investigated. Two new equations to calculate Vf are presented: when failure occurs due to sheet debonding and when the beams are provided with bonded anchorage at the top face of beams.