Flexural behavior of ultra-high-performance fiber-reinforced concrete beams reinforced with GFRP and steel rebars

Doo Yeol Yoo, Nemkumar Banthia, Young Soo Yoon

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

This study describes the flexural behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC) beams reinforced with glass fiber-reinforced polymer (GFRP) rebars and hybrid reinforcements (steel + GFRP rebars). Three GFRP bar-reinforced beams and four hybrid reinforced beams with different reinforcement ratios were fabricated and tested. Owing to the strain-hardening characteristics of UHPFRC, all test beams exhibited very stiff load-deflection behavior after the formation of cracks and satisfied the service crack width criteria of CAN/CSA S806. In addition, deformability factors higher than the lower limit of CAN/CSA-S6 were obtained for all test beams. The increase in the reinforcement ratio of GFRP rebars resulted in the improvement of their flexural performances, including post-cracking stiffness, load carrying capacity, and ductility (or deformability). The use of hybrid reinforcements by replacing a part of a GFRP rebar with a steel rebar contributed to a higher post-cracking stiffness before steel yielding, but led to lower deformability. Based on a sectional analysis, both AFGC/SETRA and JSCE recommendations were appropriate for predicting the moment-curvature response of UHPFRC beams with GFRP rebars and hybrid reinforcements: the average ratios of the maximum moments obtained from experiments and numerical analyses were found to be 1.12 and 0.94, respectively.

Original languageEnglish
Pages (from-to)246-262
Number of pages17
JournalEngineering Structures
Volume111
DOIs
Publication statusPublished - 2016 Mar 15

Keywords

  • Ductility
  • Glass fiber-reinforced polymer
  • Hybrid reinforcement
  • Sectional analysis
  • Serviceability
  • Ultra-high-performance fiber-reinforced concrete

ASJC Scopus subject areas

  • Civil and Structural Engineering

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