A model for the bond-slip of a GFRP bar in concrete

Omid Gooranorimi, Wimal Suaris, Antonio Nanni

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Glass fiber reinforced polymer (GFRP) bars are emerging as desirable alternatives for traditional steel reinforcements in concrete industry. A proper bond between concrete and reinforcement is critical for the performance of reinforced concrete structures. Due to the complexity of modeling the bond action, a perfect bond has been usually considered with the slippage between concrete and reinforcement neglected. The purpose of the present study is to develop a parametric bond-slip model based on pull-out tests performed on sand coated GFRP bars. It included exponential rising, linear descending and residual constant bond stress stages. A sensitivity analysis was performed to determine the bond parameters. Different points along the embedded length of the bar were monitored to illustrate the difference between the average and nodal bond-slip relationships. The proposed bond model was used in a finite element analysis that modeled the cracking in concrete and explicitly simulated the bond action. The model was capable of presenting both concrete splitting and pull-through modes of failure. Simulations were performed on samples with different concrete covers to demonstrate both failure modes.

Original languageEnglish (US)
Pages (from-to)34-42
Number of pages9
JournalEngineering Structures
StatePublished - Sep 1 2017


  • Bond modeling
  • Concrete plasticity
  • FEM modeling
  • Glass fiber reinforced polymer
  • Pull-out test
  • Reinforced concrete

ASJC Scopus subject areas

  • Civil and Structural Engineering


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