FRP-Strengthening in Shear: Tests and Design Equations


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Title: FRP-Strengthening in Shear: Tests and Design Equations

Author(s): G. Monti and M.A. Liotta

Publication: Special Publication

Volume: 230


Appears on pages(s): 543-562

Keywords: FRP; shear design equations; shear strengthening; shear tests

Date: 10/1/2005

This paper presents the results of an experimental/analytical study aimingat obtaining a clear understanding of the underlying mechanisms of the shearstrengthening of reinforced concrete beams with fibre reinforced polymers (FRP).Through the definition of the generalised constitutive law of a bonded FRP sheet, of thecompatibility imposed by the shear crack opening, and of the appropriate boundaryconditions depending on the strengthening configuration, analytical expressions of thestress field in the FRP sheet crossing a shear crack are obtained. These expressionsallow to easily define closed-form equations for the effective strength of FRP strips/sheets used for shear strengthening, as function of both the adopted strengtheningconfiguration and some basic geometric and mechanical parameters. The FRPcontribution is then added to those of concrete and steel. The equations accuracy hasbeen verified through correlation studies with experimental results obtained from theliterature and from laboratory tests on purposely under-designed real-scale beamspecimens, strengthened with different FRP schemes.