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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Use of Anchored Carbon Fiber-Reinforced Polymer Strips for Shear Strengthening of Large Girders
Author(s): William A. Shekarchi, Wassim M. Ghannoum, and James O. Jirsa
Publication: Structural Journal
Appears on pages(s): 281-291
Keywords: carbon-fiber reinforced polymer (CFRP); CFRP anchors; reinforced concrete (RC); shear behavior; shear strengthening
Abstract:The objective of this research was to investigate the feasibility of increasing the shear capacity of large reinforced concrete girders using anchored carbon fiber-reinforced (CFRP) strips. In an experimental study consisting of nine tests, the effects of unidirectional and bidirectional CFRP layouts, anchored and fully wrapped systems, retrofitting uncracked and precracked sections, and loading conditions on the shear performance of large girders with relatively wide webs were investigated. Test results indicated that CFRP anchors were able to develop the fracture strength of the CFRP strips despite some anchors being placed in flexural tension zones. The unidirectional CFRP layouts were able to improve the shear capacity by as much as 56% while the bidirectional layouts improved the inclined cracking shear load by as much as 22%. Moreover, the measured lower-bound average CFRP fracture strain was found to be significantly larger (0.007) than the maximum permitted effective strain (0.004) currently recommended for design.
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