KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Confining Effect of an Internal Steel Tube in a Circular Hollow RC Column

원형 강관 삽입 중공 RC 기둥의 내부구속 효과 연구

  • 한택희 (고려대학교 공학기술연구소) ;
  • 김홍중 (고려대학교 사회환경시스템공학과) ;
  • 김영종 ((주)동성엔지니얼이 구조부) ;
  • 강영종 (고려대학교 사회환경시스템공학과)
  • Received : 2005.03.10
  • Accepted : 2006.05.04
  • Published : 2006.07.31
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Abstract

When concrete is confined, its strength is enhanced by confining stress. Thus, increasing confining stress makes concrete strength higher. But a brittle failure may occur in hollow RC(Reinforced Concrete) column although its concrete is confined by transverse reinforcements. This brittle failure results from the absence of internal confinement and it decreases the strength and the ductility of a hollow RC column. To overcome this brittle failure problem, a hollow RC column which has a internal steel tube was developed. In this study, an experiment was performed to investigate the existence of to internal confinement by a settled steel tube. Thirty six specimens were tested and test results show the existence of internal confinement by the increase of concrete strength.

구속된 콘크리트는 구속되지 않은 콘크리트에 비해 상당히 큰 강도를 갖는다. 따라서 콘크리트의 구속응력을 증가시키는 것은 강도의 증가를 유도할 수 있다. 하지만 중공교각의 경우, 심부구속력의 부재로 인하여 중공교각의 안쪽면에서 취성파괴가 발생하며, 이는 기둥의 강도 저하 및 연성의 저하를 초래한다. 이러한 문제를 극복하기 위하여, 강관 삽입 중공 RC(Reinforced Concrete) 기둥이 개발되었으며, 본 연구에서는 실험을 통하여 삽입 강관에 의한 내부 구속력의 효과를 검증하였다. 총 36개의 시험체를 제작하여 실험을 수행하였으며, 실험 결과를 통하여 삽입 강관의 구속력과 이로 인한 콘크리트의 강도 증가를 확인하였다.

Keywords

References

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