Effect of glass fiber-reinforced polymer reinforcement ratio on axial-flexural strength of reinforced concrete columns

M. Guérin, H. M. Mohamed, B. Benmokrane, C. K. Shield, A. Nanni

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63 Scopus citations


A set of requirements parallel to those of ACI 318 has been proposed to generalize the design of reinforced concrete (RC) columns to include glass fiber-reinforced polymer (GFRP) bars in an anticipated GFRP-RC design code currently under preparation by ACI Committee 440. The prudent course of action prior to implementing such requirements, however, is to verify them with a comprehensive experimental study. In this study, 12 full-scale RC columns with a 405 x 405 mm (16 x 16 in.) cross section were designed, fabricated, and tested. The columns were reinforced with GFRP bars and ties. Three different longitudinal reinforcement ratios were investigated (1.0, 1.4, and 2.5%), resulting in three groups of four identical columns (similar reinforcement ratios) that were tested under four different levels of eccentricity. Experimental axial force-moment (P-M) interaction diagrams were constructed for each group. The effect of the longitudinal reinforcement ratio on strength, failure mode, deformation, and strain behavior is presented. A strain compatibility model has been developed, verified with experimental results, and used to provide a parametric study of the critical parameters affecting behavior. The parametric study covered a wide range of concrete strength and reinforcement ratios while considering or neglecting GFRP contribution in the compression zone. The resulting P-M interaction diagrams are presented and discussed.

Original languageEnglish (US)
Pages (from-to)1049-1061
Number of pages13
JournalACI Structural Journal
Issue number4
StatePublished - Jul 2018

Bibliographical note

Funding Information:
The authors would like to express their special thanks and gratitude to the Natural Science and Engineering Research Council of Canada (NSERC), the NSERC Industrial Research Chair in FRP Reinforcement for Concrete Infrastructure, and the Fonds de la recherche du Quebec–Nature et Tech-nologie – (FRQ-NT) for their financial support. The authors would like to thank Pultrall Inc. (Thetford Mines, QC, Canada) for donating the GFRP bars and ties, and the technical staff of the Structural and Materials Lab in the Department of Civil Engineering at the University of Sherbrooke.

Publisher Copyright:
© 2018, American Concrete Institute. All rights reserved.


  • Column
  • Compression
  • Eccentric
  • Failure mode
  • Glass fiber-reinforced polymer reinforcement
  • P-M interaction diagram


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