Ultimate shear capacity of reinforced concrete beams strengthened with web-bonded fiber-reinforced plastic plates

Amir M. Malek, Hamid Saadatmanesh

Research output: Contribution to journalArticle

69 Scopus citations

Abstract

The ultimate shear capacity of reinforced concrete beams can be increased by epoxy-bonding fiber-reinforced plastic (FRP) plates to web of the beam. The shear crack inclination angle is changed as a result of bonding of the plate. In this paper truss analogy and compression field theory are used to determine the effect of the FRP plate on the shear capacity and crack inclination angle of reinforced concrete beams at ultimate state. Following the calculation of the crack inclination angle, the equilibrium and compatibility equations are used to obtain the shear force resisted by the plate. A parametric study was carried out to reveal the effect of important parameters such as plate thickness and fiber orientation on the crack inclination angle and shear capacity. The upper bound value of crack inclination angle found in this study is suggested as a conservative value for determining the shear capacity of the retrofitted beam. Knowing the inclination angle of cracks, the shear force in the composite plate and concrete beam can be calculated and used for the design of this type of beam. The results of this method have shown close agreement to experimental results.

Original languageEnglish (US)
Pages (from-to)391-399
Number of pages9
JournalACI Structural Journal
Volume95
Issue number4
StatePublished - Jul 1 1998

Keywords

  • Composite
  • Fabric
  • Fiber
  • Plated beam
  • Reinforced plastic
  • Repair
  • Retrofit
  • Shear strengthening
  • Ultimate capacity
  • Web-bonded

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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