Experimental and analytical investigations on debonding of hybrid FRPs for flexural strengthening of RC beams

Eunsoo Choi, Nadia Utui, Hee Sun Kim

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30 Scopus citations

Abstract

This paper presents experimental and analytical studies aimed at investigating debonding of hybrid fiber reinforced polymers (FRPs) used to strengthen reinforced concrete (RC) beams. Towards this goal, an existing bending test method for small RC beams is modified to induce debonding failure and is adopted for reinforced concrete beams strengthened with one or two layers of carbon FRP (CFRP) or glass FRP (GFRP). From the experiments, strains on FRPs are measured and used to calculate interfacial stress between the concrete and FRP surfaces. Finite element (FE) models including debonding behavior in cohesive elements are generated to verify experimental results. Further, parametric studies are performed to predict the structural behaviors of RC beams strengthened with three layers of hybrid FRPs.

Original languageEnglish
Pages (from-to)248-256
Number of pages9
JournalComposites Part B: Engineering
Volume45
Issue number1
DOIs
StatePublished - Feb 2013

Keywords

  • A. Hybrid
  • A. Laminates
  • B. Debonding
  • C. Analytical modeling
  • Interfacial stress

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