Mechanics and failure characteristics of hybrid fiber-reinforced concrete (HyFRC) composites with longitudinal steel reinforcement

Wilson Nguyen, Matthew J. Bandelt, William Trono, Sarah L. Billington, Claudia P. Ostertag

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

While the properties of hybrid fiber-reinforced concrete (HyFRC) have been well-reported in the literature, the behavior of reinforced HyFRC (i.e., HyFRC with embedded steel rebar) is less understood. This paper investigates the mechanics and failure characteristics of reinforced HyFRC under direct tension. Samples with a low longitudinal steel reinforcement ratio were studied to evaluate the feasibility of reducing rebar congestion in structural applications through the use of fiber-reinforced concrete. Although reinforced HyFRC forms multiple cracking sites when loaded, rebar strain and HyFRC crack opening are generally concentrated at a single location under post-yield displacements. The onset of rebar plastic deformation and the exhaustion of fibers’ bridging load capacity are coincident events at a dominant crack. For a cracked reinforced HyFRC section to strengthen, the magnitude of load resistance increase from strain hardening rebar must exceed the magnitude of load resistance decrease from fiber pull-out processes. Comparisons are made with studies reported in the literature to demonstrate how longitudinal reinforcement ratio and fiber type influence cracking behavior and ultimate strain capacity. The research presented herein has far-reaching impacts on the structural design of all types of reinforced fiber-reinforced concrete materials detailed for a ductile response under large displacements.

Original languageEnglish (US)
Pages (from-to)243-254
Number of pages12
JournalEngineering Structures
Volume183
DOIs
StatePublished - Mar 15 2019

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering

Keywords

  • Bond-slip
  • HPFRCC
  • High-performance fiber-reinforced cementitious composites
  • Inelastic
  • Pull out
  • Reinforcement ratio
  • Splitting crack
  • Strain hardening
  • Strain localization
  • Tension stiffening

Fingerprint Dive into the research topics of 'Mechanics and failure characteristics of hybrid fiber-reinforced concrete (HyFRC) composites with longitudinal steel reinforcement'. Together they form a unique fingerprint.

Cite this