Size effects for reinforced concrete beams strengthened in shear with CFRP strips

A. Godat, Z. Qu, X. Z. Lu, P. Labossìre, L. P. Ye, K. W. Neale

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)


The principal motivation of this study is to obtain a clear understanding of size effects for fiber-reinforced polymer (FRP) shear-strengthened beams. The experimental program consists of seven beams of various sizes grouped in three test series. One beam of each series is used as a benchmark and its behavior is compared with a beam strengthened with a U-shaped carbon FRP (CFRP) jacket. The third test series includes an additional beam strengthened with completely wrapped external CFRP sheets. The experimental results show that the effective axial strains of the CFRP sheets are higher in the smaller specimens. Moreover, with a larger beam size, one can expect less strain in the FRPs. A nonlinear finite-element numerical analysis is developed to model the behavior of the CFRP shear-strengthened beams. The numerical model is able to simulate the characteristics of the shear-strengthened beams, including the interfacial behavior between the concrete and the CFRP sheets. Three prediction models available in current design guidelines for computing the CFRP effective strain and shear contribution to the shear capacity of the CFRP shear-strengthened beams are compared with the experimental results.

Original languageEnglish
Pages (from-to)260-271
Number of pages12
JournalJournal of Composites for Construction
Issue number3
Publication statusPublished - 2010
Externally publishedYes


  • Axial strain
  • Concrete beams
  • Experimental data
  • Fiber-reinforced plastics
  • Numerical models
  • Shear strength

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Mechanical Engineering


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