International Journal of Structural Analysis & Design
Author(s) : ILLAKKIYA B , REVATHY JAYASEELAN , SARANYA S
The paper explores the results of an experimental study concerning the flexural strengthening of prestressed concrete beams using fibre reinforced polymer (FRP) laminates. Five unbonded post-tensioned concrete beams were tested in the laboratory to evaluate the strength enhancement provided by the FRP plates. Four beams were strengthened with different orientations and thicknesses of FRP laminates. Structural behaviour of the prestressed concrete beams were evaluated in terms of strength, stiffness, composite action between FRP laminate and concrete and the associated failure modes were tested under a static gradual loading up to failure. The test results indicate that the FRP plated unbonded post-tensioned concrete beams considerably increase the strength, stiffness and composite action until failure. The failure of the specimen occurred either by crushing of concrete and/or by FRP rupture.