International Journal of Concrete Structures and Materials

Korea Concrete Institute (한국콘크리트학회)
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Confinement Effects of High-Strength Reinforced Concrete Tied Columns

  • Han, Byum-Seok (Sustainable Building Research Center, Hanyang University) ;
  • Shin, Sung-Woo (School of Architecture and Architectural Engineering, Hanyang University)
  • Published : 2006.09.30
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Abstract

An experimental study was conducted to investigate the effectiveness of transverse steel in reinforced concrete tied columns subjected to monotonically increasing axial compression. Eighteen large-scale columns($260{\times}260{\times}1,200mm$) were tested. Effects of such main variables as concrete compressive strength, configurations of transverse steel, transverse reinforcement ratio, spacing of transverse steel, and spalling of concrete cover were investigated. High-strength concrete columns under concentric axial loads show extremely brittle behavior unless the columns are confined with transverse steel that can provide sufficiently high lateral confinement pressure. A consistent decrease in the deformability of the column test specimens was observed with increasing concrete strength. Test results of this study were compared with existing confinement models of modified Kent-Park, Sheikh-Uzumeri, Mander, and Saatcioglu-Razvi. The comparison indicates many existing models to predict the behavior of confined concrete overestimate or underestimate the ductility of confined concrete.

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References

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