Axial load response of ultra-high-strength concrete columns and high-strength reinforcement

Hyun Oh Shin, Young Soo Yoon, William D. Cook, Denis Mitchell

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


Eight ultra-high-strength concrete (UHSC) square columns were constructed and tested to investigate the effects of yield strength of transverse (fyh ≈ 550 and 800 MPa [79.8 and 116.0 ksi]) and longitudinal reinforcement (fyh ≈ 480 and 640 MPa [69.6 and 92.8 ksi]) on axial load response. The UHSC had compressive strengths varying from 185 to 200 MPa (26.8 to 29.0 ksi). The effects of using high-strength transverse reinforcement with two different configurations and amounts were evaluated. For a constant amount of confinement reinforcement, high-strength transverse reinforcement improves the performance of well-confined UHSC columns in terms of strength, post-peak deformability, and toughness, provided that the hoops are detailed with proper end anchorage (135-degree seismic hooks). The use of high-strength transverse reinforcement was also effective in reducing steel congestion for UHSC columns. The effects of using high-strength longitudinal reinforcement in UHSC columns were also studied. It was determined that the combination of high-strength longitudinal reinforcement and UHSC results in yielding of this reinforcement. However, for typical longitudinal reinforcement ratios, the benefit of using high-strength longitudinal steel is limited due to the relatively small contribution of this reinforcement to the strength of UHSC columns and the early cover spalling of UHSC.

Original languageEnglish
Pages (from-to)325-336
Number of pages12
JournalACI Structural Journal
Issue number2
Publication statusPublished - 2016 Mar 1


  • Axial load
  • Columns
  • Confinement
  • High-strength longitudinal reinforcement
  • High-strength transverse reinforcement
  • Ultra-high-strength concrete

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering


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