Shear behavior models of steel fiber reinforced concrete beams modifying softened truss model approaches

Jin Ha Hwang, Deuck Hang Lee, Hyunjin Ju, Kang Su Kim, Soo Yeon Seo, Joo Won Kang

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Recognizing that steel fibers can supplement the brittle tensile characteristics of concrete, many studies have been conducted on the shear performance of steel fiber reinforced concrete (SFRC) members. However, previous studies were mostly focused on the shear strength and proposed empirical shear strength equations based on their experimental results. Thus, this study attempts to estimate the strains and stresses in steel fibers by considering the detailed characteristics of steel fibers in SFRC members, from which more accurate estimation on the shear behavior and strength of SFRC members is possible, and the failure mode of steel fibers can be also identified. Four shear behavior models for SFRC members have been proposed, which have been modified from the softened truss models for reinforced concrete members, and they can estimate the contribution of steel fibers to the total shear strength of the SFRC member. The performances of all the models proposed in this study were also evaluated by a large number of test results. The contribution of steel fibers to the shear strength varied from 5% to 50% according to their amount, and the most optimized volume fraction of steel fibers was estimated as 1%-1.5%, in terms of shear performance.

Original languageEnglish
Pages (from-to)4847-4867
Number of pages21
Issue number10
StatePublished - 2013


  • SFRC
  • Shear behavior
  • Shear strength
  • Softened truss model
  • Steel fiber


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