Title: Strengthening of Reinforced Concrete T-Beams Using Anchored CFRP Materials

Author(s): Yungon Kim, Kevin Quinn, Wassim M. Ghannoum, and James O. Jirsa

Publication: Structural Journal

Volume: 111

Issue: 5

Appears on pages(s): 1027-1036

Keywords: carbon fiber-reinforced polymers; CFRP anchors; reinforced concrete; shear strengthening; T-beam

DOI: 10.14359/51687025

Date: 9/1/2014

Abstract:
Sixteen reinforced concrete T-beams were tested to evaluate the shear performance of beams strengthened externally with carbon fiber-reinforced polymer (CFRP) laminates and CFRP anchors. Monotonically increasing load was applied to the reinforced concrete members at three different shear span-to-depth ratios until shear failure. Other test variables included the amount of transverse steel, the layout and amount of CFRP laminates, bond between the CFRP laminates and the beam surface, and inclination of CFRP anchors. All specimens were 24 in. (610 mm) deep. Beams strengthened with anchored CFRP laminates showed a much larger shear strength increase than those strengthened with unanchored laminates. In all cases, CFRP anchors increased the contribution of the CFRP laminates to the shear capacity. Test results indicate that current design procedures for external CFRP shear strengthening should be modified to account for interactions between concrete, steel, and CFRP.