콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제29권1호
  • /
  • Pages.43-51
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  • 2017
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  • 1229-5515(pISSN)
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  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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세장비 및 대각철근 유무에 따른 고강도 철근보강 콘크리트 연결보의 전단성능

Effect of Aspect Ratio and Diagonal Reinforcement on Shear Performance of Concrete Coupling Beams Reinforced with High-Strength Steel Bars

  • 김선우 (충남대학교 건설공학교육과) ;
  • 장석준 (충남대학교 건축공학과) ;
  • 윤현도 (충남대학교 건축공학과) ;
  • 서수연 (한국교통대학교 건축공학과) ;
  • 천영수 (한국토지주택공사 토지주택연구원 공공주택연구실)
  • Kim, Sun-Woo (Dept. of Construction Engineering Education, Chungnam National University) ;
  • Jang, Seok-Joon (Dept. of Architectural Engineering, Chungnam National University) ;
  • Yun, Hyun-Do (Dept. of Architectural Engineering, Chungnam National University) ;
  • Seo, Soo-Yeon (Dept. of Architectural Engineering, Korea National University of Transportation) ;
  • Chun, Young-Soo (Public Housing Research Department, Land & Housing Institute)
  • 투고 : 2016.08.29
  • 심사 : 2016.12.05
  • 발행 : 2017.02.28
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초록

현행 규정에 따르면, 세장비 4 미만의 연결보에 대각철근을 사용하도록 규정하고 있다. 그러나 대각선 다발철근 상세는 보 내부의 철근 배근작업을 어렵게 만들고, 이는 또한 시공불량으로 이어질 수 있다. 본 연구에서는 고강도 철근(SD500 및 SD600)으로 보강된 콘크리트 연결보에 관한 실험결과를 나타내었다. 연결보 제작시 시공성을 향상시키기 위하여, 본 연구에서는 헤드바를 갖는 대구경 철근을 사용하였다. 배근상세 및 세장비를 변수로 하여, 2가지의 실규모 연결보를 제작 및 실험하였다. 전단벽을 연결하는 보의 실제 거동특성을 모사하기 위하여, 링크 조인트를 갖는 철골 구조물을 반력바닥에 설치하였다. 실험 결과, 연결보와 전단벽 접합부에서의 균열 및 철근이 항복되면서, 점차 연결보 중앙부로 손상이 진전되는 것으로 나타났다. 연결보는 FEMA 450-1의 설계변위에 대한 전단벽 층간변위 규정에 요구되는 변형능력을 충분히 갖는 것으로 나타났다. 그러나 고강도 철근으로 보강된 연결보의 상세설계를 위해서는, 다양한 세장비가 연결보의 구조거동에 미치는 영향에 관한 연구가 필요하다.

As per current seismic design codes, diagonally reinforced coupling beams are restricted to coupling beams having aspect ratio below 4. However, a grouped diagonally reinforcement detail makes distribution of steel bars in the beam much harder, furthermore it may result in poor construction quality. This paper describes the experimental results of concrete coupling beam reinforced with high-strength steel bars (SD500 & SD600 grades). In order to improve workability for fabricating coupling beams, a headed large diameter steel bar was used in this study. Two full-scale coupling beams were fabricated and tested with variables of reinforcement details and aspect ratio. To reflect real behavior characteristic of the beam coupling shear walls, a rigid steel frame system with linked joints was set on the reaction floor. As a test result, it was noted that cracking and yielding of reinforcement were initially progressed at the coupling beam-to-shear wall joint, and were progressed to the mid-span of the coupling beam, based on the steel strain and failure modes. It was found that the coupling beams have sufficient deformation capacity for drift ratio of shear wall corresponding to the design displacement in FEMA 450-1. In this study, the headed horizontal steel bar was also efficient for coupling beams to exhibit shear performance required by seismic design codes. For detailed design for coupling beam reinforced with high-strength steel, however, research about the effect of variable aspect ratios on the structural behavior of coupling beam is suggested.

키워드

참고문헌

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