Effect of steel fibers on minimum shear reinforcement of high-strength concrete beams

Chul Goo Kim, Hyerin Lee, Hong Gun Park, Geon Ho Hong, Su Min Kang

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Minimum shear reinforcement is required for reinforced concrete (RC) flexural members to prevent brittle shear failure considering uncertainty of concrete shear strength in current design codes. In ACI 318-14, the use of steel fibers for minimum shear reinforce-ment is permitted within limited ranges of design parameters such as a concrete compressive strength lower than 40 MPa (5.8 ksi), beam depth smaller than 600 mm (24 in.); and fiber volume ratio over 0.75%. In this study, the effect of steel fibers on the shear strength was studied for high-strength concrete beams (60 MPa [8.7 ksi]). The main test parameters were the concrete strength, use of steel fibers, and use of stirrups. The test results showed that steel fibers with a volume fraction of 0.75% significantly increased the shear strength of high-strength concrete beams. This is mainly because the high-strength concrete increased the contribution of the steel fibers by increasing the tension zone depth. Such effect of steel fibers was confirmed by results from previous studies. The test results also showed that the limitation of concrete strength can be increased from 40 to 60 MPa (5.8 to 8.7 ksi).

Original languageEnglish
Pages (from-to)1109-1119
Number of pages11
JournalACI Structural Journal
Issue number5
StatePublished - 1 Sep 2017

Bibliographical note

Funding Information:
This research was supported by a grant (Code 11-Technology Standardization-07-01) from the Construction & Transportation Technology Advancement Research Program funded by the Ministry of Land, Infrastructure and Transport (MOLIT) of the Korean government and by Institute of Engineering Research at Seoul National University. The authors are grateful for their support.

Publisher Copyright:
© Copyright 2017, American Concrete Institute. All rights reserved.


  • High-Strength Concrete
  • Minimum Shear Reinforcement
  • Rein-forced Concrete
  • Shear Strength
  • Steel Fiber
  • Stirrup.


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