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Architectural Institute of Korea (대한건축학회)
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Pullout Test of Headed Reinforcing Bar in RC or SFRC Members with Side-Face Blowout Failure

  • Lee, Chang-Yong (Department of Architecture Engineering, Hanbat National University) ;
  • Kim, Seung-Hun (Department of Architecture Engineering, Hanbat National University) ;
  • Lee, Yong-Taeg (Department of Architecture Engineering, Hanbat National University)
  • Received : 2020.01.10
  • Accepted : 2020.03.06
  • Published : 2020.03.30
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Abstract

In this study, side-face blowout failure strength of high strength headed reinforcing bar, which is vertically anchoring between RC or SFRC members, is evaluated throughout pullout test. The major test parameters are content ratio of high strength steel fibers, strength of rebar, length of anchorage, presence of shear reinforcement, and the side concrete cover thickness planned to be 1.3 times of the rebar. In pullout test, tensile force was applied to the headed reinforcing bar with the hinged supports positioned 1.5 and 0.7 times the anchorage length on both sides of the headed reinforcing bar. As a result, the cone-shaped crack occurred where the headed reinforcing bar embedded and finally side-face blowout failure caused by bearing pressure of the headed reinforcing bar. The tensile strength of specimens increased by 13.0 ~26.2% with shear reinforcement. The pullout strength of the specimens increased by 3.6 ~15.4% according to steel fiber reinforcement. Increasing the anchoring length and shear reinforcement were evaluated to reduce the stress bearing ration of the total stress.

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