Effect of confining FRP overlays on bond strength enhancement

OZDEN S., Akpinar E.

CONSTRUCTION AND BUILDING MATERIALS, vol.21, no.7, pp.1377-1389, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 21 Issue: 7
  • Publication Date: 2007
  • Doi Number: 10.1016/j.conbuildmat.2006.08.003
  • Journal Name: CONSTRUCTION AND BUILDING MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1377-1389
  • Keywords: bond strength, reinforced concrete, normal strength concrete, confinement, carbon fiber reinforced polymer (CFRP), glass fiber reinforced polymer (GFRP), TENSION LAP SPLICES, REINFORCING BARS, TRANSVERSE REINFORCEMENT, STEEL REBAR, CONCRETE, BEHAVIOR, BEAMS
  • Kocaeli University Affiliated: Yes

Abstract

in this study, changes in the bond strength of reinforcing bars due to external confinement, through FRP overlays, was investigated. Eccentric pullout specimens with insufficient bond length and with two different normal strength concrete levels were reinforced with single deformed bars placed with a small cover thickness. Three reinforcing bar sizes and two FRP types, each having two different number of layers, were used in the experiments. Significant enhancement in bond strength due to FRP confinement was observed in all specimens. Although the increase in bond strength was closely related to the clamping force developed by the FRP overlays, the effectiveness of the invoked clamping force reduces beyond a limiting value. The orientation of the splitting cracks was also affected by the existence of the FRP overlays. (c) 2006 Elsevier Ltd. All rights reserved.