Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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A Study for Shear Deterioration of Reinforced Concrete Beam-Column Joints Failing in Shear after Flexural Yielding of Adjacent Beams

보의 휨항복 후 접합부가 파괴하는 철근콘크리트 보-기둥 접합부의 전단내력 감소에 대한 해석적 연구

  • Park, Jong-Wook (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Yun, Seok-Gwang (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Kim, Byoung-Il (Dept. of Architectural Engineering, Sungkyunkwan University) ;
  • Lee, Jung-Yoon (Dept. of Architectural Engineering, Sungkyunkwan University)
  • 박종욱 (성균관대학교 건축공학과) ;
  • 윤석광 (성균관대학교 건축공학과) ;
  • 김병일 (성균관대학교 건축공학과) ;
  • 이정윤 (성균관대학교 건축공학과)
  • Received : 2012.02.03
  • Accepted : 2012.04.03
  • Published : 2012.08.31
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Abstract

Beam-column joints are generally recognized as the critical regions in the moment resisting reinforced concrete (RC) frames subjected to both lateral and vertical loads. As a result of severe lateral load such as seismic loading, the joint region is subjected to horizontal and vertical shear forces whose magnitudes are many times higher than in column and adjacent beam. Consequently, much larger bond and shear stresses are required to sustain these magnified forces. The critical deterioration of potential shear strength in the joint area should not occur until ductile capacity of adjacent beams reach the design demand. In this study, a method was provided to predict the deformability of reinforced concrete beam-column joints failing in shear after the plastic hinges developed at both ends of the adjacent beams. In order to verify the deformability estimated by the proposed method, an experimental study consisting of three joint specimens with varying tensile reinforcement ratios was carried out. The result between the observed and predicted behavior of the joints showed reasonably good agreement.

철근콘크리트 보-기둥 접합부는 구조물 전체의 거동에 가장 크게 영향을 주는 부재 중 하나이다. 보와 기둥의 상대적인 강도 차이가 줄어들면서 지진에 의한 피해가 접합부에도 발생하고 있다. 지진하중과 같은 횡방향 반복하중이 작용하게 되면 접합부는 휨보다는 수직 혹은 수평방향 전단이나 부착에 대한 저항력이 중요하다. 따라서 접합부에 대한 내진설계는 설계자가 의도한 연성에 만족할 때까지 전단이나 부착에 대한 내력이 크게 감소하지 않는 수준의 설계가 요구된다. 하지만 인접보 소성힌지의 변형률 침투와 침투한 변형률의 영향으로 인해서 접합부의 변형이 발생하게 되고 접합부의 내력은 설계자의 요구 수준을 만족하지 못할 수도 있다. 이 논문에서는 부재 각 요소가 내부 접합부에 미치는 변형과 감소하는 전단내력을 파악하고 연성을 계산하는 모델을 제시하였다. 힘의 평형과 변형률 적합조건, 다른 연구자들의 이론을 참고하여 구축하였으며 모델을 실제 실험에 적용하였을 경우 타당한 범위 내에서 평가하였다. 다른 실험 데이터에 대한 추가적인 분석으로 불완전한 부분을 파악하고 개선하여 결과에 대한 오차를 줄이는 연구가 필요하다.

Keywords

References

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