Strengthened Beam Essay

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STRENGTHENING ON RC BEAM ELEMENTS WITH GFRP UNDER FLEXURE
T.Srividya,
Assistant Professor in Civil Engineering,
Tagore Engineering College
Chennai 127 B. Saritha
Assistant Professor in Civil Engineering,
Bharath University
Chennai 73

Abstract: The study of this project is concerned with the investigation of the efficiency of GFRP composites in strengthening simply supported reinforced concrete beams designed with insufficient flexure capacity. The test results of seven beams, addressing the influence of flexure strengthening and their flexure capacity were compared with ultimate flexure capacity of R.C section using IS 456-2000.

I. INTRODUCTION

This project deals with the GFRP composite as an additional material with reinforcements.
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DISCUSSION OF RESULTS
1. NORMAL BEAM This beam was designed & tested. The initial crack was found at 58 kN. By proceeding load increment, cracks were developed at closer intervals. The ultimate load was noted and it was 71kN for this reference beam. The maximum deflection at mid of the strengthened beam at the failure was found as 6.5 mm.
2. NORMAL BEAM SRENGTHENED The ultimate load bearing capacity of strengthened beam was 81.5 kN. Provision of the GFRP at bottom had considerably increased the load carrying capacity by 14.8%. The GFRP laminates acted as externally bonded reinforcement and provided additional stiffness. The maximum deflection at mid of the strengthened beam at the failure was found as 20.45 mm.
3. FLEXURE BEAM This beam was designed to fail by flexure. This flexure beam was tested. The initial crack was found at 25 kN. By proceeding load increment, cracks were developed at closer intervals. The cracks propagated in the flexure zone. The ultimate load was noted and it was 60.4 kN for this beam. The maximum deflection at mid of the strengthened beam at the failure was found as 18.42 mm. 4. FLEXURE BEAM WRAPPED WITH GFRP ON ALL FOUR SIDES
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Instead of single layer, we can go for two or three layer wrapping for improving its strength.
3. In this study Iso-thalmic resin was used, It can be tried with other resins.
4. This technique can also be adopted for shear failure & rehabitation of earthquake affected structures.

REFERENCES

1) Saadatmanesh and Ehsani M.R, “RC beams Strengthened with GFRP plates, Experimental study”, Journal of the Structural division, ASEC, v.117, no.11, 1991, p.p.3417-3433.
2) Grace N.F., Sayed G.A.Soliman.A.K.and Salehk.R. “Strengthening of Reinforced concrete beams using fibre reinforced polymer (FRP) laminates”, ACI Structural Journal sep/oct-1999,p.p.865-874.
3) H.Saadatmanesh and Malek A.M., “Design Guidelines fro Flexural Strengthening of RC beams with FRP plates”, Journal of composites for construction, Nov-98, p.p.158-164.
4) Alfarabi Sharif, G.J.Al-Sulsalamani, I.A.Basinbul, M.H.Baluch and B.N.Ghaleb., “Strengthening of Initially loaded Reinforced concrete beams using plates”, ACI Structural Journal mar/apr.p.p160-167.
5) Nabil F Grace, George Abdel-Sayed and Wael F.Ragheb, “Strengthening Of Concrete Beams Using Innovative Ductile Fiber-Reinforced Polymer Fabric”-ACI Structural Journal-Sep/Oct-2002.

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