Prediction of failure load of R/C beams strengthened with FRP plate due to stress concentration at the plate end

Amir M. Malek, Hamid Saadatmanesh, Mohammad R. Ehsani

Research output: Contribution to journalArticlepeer-review

367 Scopus citations

Abstract

Epoxy-bonding a composite plate to the tension face is an effective technique for repair and retrofit of reinforced concrete beams. Experiments have indicated local failure of the concrete layer between the plate and longitudinal reinforcement in retrofitted beams. This mode of failure is caused by local stress concentration at the plate end as well as at the flexural cracks. This paper presents a method for calculating shear and normal stress concentration at the cutoff point of the plate. This method has been developed based on linear elastic behavior of the materials. The effect of the large flexural cracks along the beam has also been investigated. The model has been used to find the shear stress concentration at these cracks. The predicted results have been compared to both finite element method and experimental results. The analytical models provide closed form solutions for calculating stresses at the plate ends that can easily be incorporated into design equations.

Original languageEnglish (US)
Pages (from-to)142-152
Number of pages11
JournalACI Structural Journal
Volume95
Issue number2
StatePublished - Mar 1 1998

Keywords

  • Analytical modeling
  • Epoxy
  • Fiber composites
  • Interfacial stress
  • Local failure
  • Peeling failure
  • Plating
  • Repair
  • Retrofit
  • Stress concentration

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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