Shear Strengthening of RC Beams with Near-Surface-Mounted CFRP Laminates


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Title: Shear Strengthening of RC Beams with Near-Surface-Mounted CFRP Laminates

Author(s): S. Dias and J. Barros

Publication: Special Publication

Volume: 230


Appears on pages(s): 807-824

Keywords: carbon fiber reinforced polymers; externally bonded reinforcing; near surface mounted; shear strengthening

Date: 10/1/2005

The efficacies of the Near Surface Mounted (NSM) and Externally BondedReinforcing (EBR) techniques for the shear strengthening of rectangular cross sectionRC beams are compared. Both techniques are based on the use of carbon fiberreinforced polymer (CFRP) materials. The NSM was the most effective technique, andwas also the easiest and fastest to apply, and assured the lowest fragile failure modes.The performance of the ACI and fib analytical formulations for the EBR shearstrengthening was appraised. In general, the contribution of the CFRP systemspredicted by the analytical formulations was larger than the values registeredexperimentally. The capability of the De Lorenzis formulation of predicting thecontribution of the NSM technique for the shear strengthening of RC beams wasappraised using bond stress and CFRP effective strain values obtained in pulloutbending tests. This formulation provided values 61% lower than the values obtainedexperimentally.