Modelling of Reinforced Concrete Flexural Members Strengthened with Near-Surface Mounted FRP Reinforcement

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Title: Modelling of Reinforced Concrete Flexural Members Strengthened with Near-Surface Mounted FRP Reinforcement

Author(s): R. El-Hacha, S.H. Rizkalla, and R. Kotynia

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 1681-1700

Keywords: carbon; externally bonded; fiber-reinforced polymers;glass; near-surface mounted; rebars; reinforced concrete beam;strengthening; strips

Date: 10/1/2005

Abstract:
This paper presents an analytical investigation conducted to study theflexural behavior of reinforced concrete beams strengthened with various Near-SurfaceMounted (NSM) Fiber-Reinforced Polymers (FRP) reinforcements. The materials used inthis investigation included carbon-fiber-reinforced-polymer (CFRP) rebars and strips,and glass fiber-reinforced-polymer (GFRP) rebars and strips. The analysis included theeffects of strengthening on the serviceability and ultimate limit states as well the effectof tension stiffening. The effectiveness of NSM FRP rebars and strips was examined andcompared to externally bonded (EB) FRP strips and sheets using the same material typeand axial stiffness. Results from the analytical models were compared with thoseobtained from experimental studies. The analytical results agree very well with thoseobtained from the experimental results. It was found that the analytical model couldeffectively simulate the behaviour of the reinforced concrete beams strengthened withvarious NSM FRP and EB FRP reinforcements. Using the same axial stiffness of FRP tostrengthen reinforced concrete beams, the beams strengthened with NSM FRPreinforcement achieved higher ultimate load than beams strengthened with EB FRPreinforcement. This result is due to the high utilization of the tensile strength of the FRPreinforcement.