Physical properties of glass fiber reinforced polymer rebars in compression

D. H. Deitz, I. E. Harik, H. Gesund

Research output: Contribution to journalArticlepeer-review

117 Scopus citations


Forty-five glass fiber reinforced polymer (GFRP) rebars were tested in compression to determine their ultimate strength and Young's modulus. The rebars (or C-bars), produced by Marshall Industries Composites, Inc., had an outside diameter of 15 mm (#15 rebar), and unbraced lengths varying from 50 to 380 mm. A compression test method was developed to conduct the experiments. Three failure modes, that are directly related to the unbraced length of the rebar, are identified as crushing, buckling, and combined buckling and crushing. The crushing region represents the failure mode a GFRP rebar would experience when confined in concrete under compression. The experimental results showed that the ultimate compressive strength of the #15 GFRP rebar failing by crushing is approximately 50% of the ultimate tensile strength. Based on a very limited number of tests, in which strain readings were acceptable, Young's modulus in compression was found to be approximately the same as in tension.

Original languageEnglish
Pages (from-to)363-366
Number of pages4
JournalJournal of Composites for Construction
Issue number4
StatePublished - Nov 2003


  • Compression strength
  • Concrete, reinforced
  • Elasticity
  • Fiber reinforced polymers
  • Glass fibers
  • Structural materials

ASJC Scopus subject areas

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


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