Test of Headed Reinforcement in Pullout

  • Park, Dong-Uk (Dept. of Architecture Engineering, Hankyong National University) ;
  • Hong, Sung-Gul (Department. of Architecture, Seoul National University) ;
  • Lee, Chin-Yong (Technology & Research Institute, Conclinic Co. Ltd.)
  • 발행 : 2002.09.01

초록

Results of an experimental study on the pullout behavior of the headed reinforcement are presented. A total of 48 pullout tests was performed to evaluate pullout strengths and load-displacement behaviors in pullout of the headed bars. The square steel heads had gross area of 4 $A_{b}$ and thickness of $d_{b}$ The test program consisted of three pullout test groups: Simple and Edge pullout tests using plain concrete slabs, comparison of pullout performances between the standard hooks and the headed reinforcement, and pullout tests of headed reinforcement using reinforced concrete columns. Test variables included concrete strengths ( $f_{c}$' = 27.1MPa, 39.1MPa), reinforcing bar diameters (D16~D29), embedment depths (6 $d_{b}$~12 $d_{b}$), edge conditions, column reinforcement, and single-vs.-multiple bar pullout. Test results revealed that the heads effectively provided the pullout resistances of the deformed bars in tension. The load-displacement behaviors were similar between the 90-degree hooks and the headed reinforcement. When a multiple number of headed bars installed with small head-to-head spacings was pulled out, reinforcement designed to run across the concrete failure surface in a direction parallel to the headed bars helped improve the pullout performances of the headed reinforcement.t.ement.t.

키워드

참고문헌

  1. ACI Concrete International Headed Reinforcement A Viable Opt-ion Wallace J.W.
  2. ACI Structural Journal v.95 no.5 Use of Headed Reinforcement in Beam-Column Joints Subjected to Earthquake Loads Wallace J.W;McConnell S.W.;Gupta P.;Cote P.A
  3. American Society of Testing Materials Standard Test Methods for Strength of Anchors in Concrete and Masonry Elements ASTM
  4. Building Code Requirements for Structural Concrete (318m-99) and Commentary (318RM-99) ACI Committee 318
  5. ACI Structural Journal v.92 no.1 Concrete Capacity Design (CCD) Approach for Fastening to Concrete Fuchs W;Eligehausen R;Breen J.E
  6. ACI Structural Journal v.96 no.5 Anchorage Capacity in Concrete of Headed Reinforcement with Shallow Embedments DeVries R.A;Jirsa J.O.;Bashandy T.
  7. Ph.D.Dissertation Anchorage of Headed Reinforcement in Concrete DeVries R.A.