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Strengthening of reinforced concrete beams in flexure by partial jacketing

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Abstract

This work investigates the structural behaviour of reinforced concrete beams strengthened in bending by the addition of concrete and steel on their tension sides using expansion bolts as shear connectors, technique here denominated partial jacketing. The experimental program comprised tests on eight full-scale reinforced concrete beams, simply supported, with rectangular cross section (150 mm × 400 mm) and 4,500 mm length. Five of these beams were strengthened in bending by partial jacketing, while the other three did not receive any strengthening and served as reference beams. The flexural reinforcement ratio in the beams varied between 0.49% and 2.33% and the beams target concrete strength was 35 MPa. On the basis of the obtained test results, the studied strengthening technique proven to be efficient in terms of increasing the resistance and stiffness of the beams. The used expansion bolts as shear connectors proven to be practical and added ease to the application of this technique.

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Abbreviations

A st :

Total area of main steel

A sb :

Area of main steel in the beam

A sr :

Added area of main steel in the jacket

A sw :

Area of beam web steel

b :

Beam breadth

d :

Effective beam depth

f cm :

Average concrete compressive strength

f ct :

Tensile strength of concrete

f y :

Yield strength of reinforcement

L :

Length, span

P u :

Ultimate theoretical load

P u,exp :

Ultimate experimental load

s :

Spacing of web steel

ϕ :

Diameter

ρ st :

Total geometrical ratio of main reinforcement

ρ sw :

Geometrical ratio of web reinforcement

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Acknowledgments

The authors would like to thank HOLCIM and the Brazilian government financing agencies CNPq and CAPES for supporting this project.

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Authors and Affiliations

  1. Department of Civil Engneering, COPPE—The Federal University of Rio de Janeiro, P.O. Box 68506, CEP 21945-970, Rio de Janeiro, RJ, Brazil

    Ibrahim Abd El Malik Shehata, Lidia da Conceição Domingues Shehata, Euler Wagner Freitas Santos & Maria Luisa de Faria Simões

  2. Universidade Federal Fluminense, Niteroi, RJ, Brazil

    Lidia da Conceição Domingues Shehata

Authors
  1. Ibrahim Abd El Malik Shehata
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  2. Lidia da Conceição Domingues Shehata
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  3. Euler Wagner Freitas Santos
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  4. Maria Luisa de Faria Simões
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Corresponding author

Correspondence to Ibrahim Abd El Malik Shehata.

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Abd El Malik Shehata, I., da Conceição Domingues Shehata, L., Wagner Freitas Santos, E. et al. Strengthening of reinforced concrete beams in flexure by partial jacketing. Mater Struct 42, 495–504 (2009). https://doi.org/10.1617/s11527-008-9397-3

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  • DOI: https://doi.org/10.1617/s11527-008-9397-3

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