Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Evaluation of Horizontal Shear Strength of Prestressed Hollow-Core Slabs with Cast-in-Place Topping Concrete

프리스트레스트 중공 슬래브와 현장타설된 토핑콘크리트의 수평전단성능 평가

  • Im, Ju-Hyeuk (Dept. of Architectural Engineering, University of Seoul) ;
  • Park, Min-Kook (Dept. of Architectural Engineering, University of Seoul) ;
  • Lee, Deuck-Hang (Dept. of Architectural Engineering, University of Seoul) ;
  • Seo, Soo-Yeon (Dept. of Architectural Engineering, Korea National University of Transportation) ;
  • Kim, Kang-Su (Dept. of Architectural Engineering, University of Seoul)
  • 임주혁 (서울시립대학교 건축학부) ;
  • 박민국 (서울시립대학교 건축학부) ;
  • 이득행 (서울시립대학교 건축학부) ;
  • 서수연 (한국교통대학교 건축공학과) ;
  • 김강수 (서울시립대학교 건축학부)
  • Received : 2014.07.03
  • Accepted : 2014.08.05
  • Published : 2014.12.31
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Abstract

Prestressed hollow-core (PHC) slabs are structurally-optimized lightweight precast floor members for long-span concrete structures, which are widely used in construction markets. In Korea, the PHC slabs have been often used with cast-in-place (CIP) topping concrete as a composite slab system. However, the PHC slab members produced by extrusion method use concrete having very low slump, and it is very difficult to make sufficient roughness on the surface as well as to provide shear connectors. In this study, a large number of push-off tests was conducted to evaluate interfacial shear strengths between PHC slabs and CIP topping concrete with the key variable of surface roughness. In addition, the horizontal shear strengths specified in the various design codes were evaluated by comparing to the test results that were collected from literature.

프리스트레스트 중공(PHC) 슬래브는 장경간에 적합하도록 경량화된 효율적인 프리캐스트 부재이며, 국내 외에서 많이 사용되고 있다. 특히, 국내에서는 현장타설콘크리트와 같이 사용되는 합성슬래브 형태로 주로 적용되고 있다. 그러나, 압출성형방식으로 제작되는 PHC 슬래브 부재는 매우 낮은 슬럼프의 콘크리트로 제작되어 타설 직후에도 표면경도가 높기 때문에 계면의 거친면 처리 및 전단연결재 배치가 어려운 단점이 있다. 이 연구에서는 PHC slab 부재와 토핑콘크리트 사이의 합성성능을 고찰하기 위하여 다양한 계면상태를 변수로 직접전단실험을 수행하였으며, 기존 실험결과를 수집하여 국내 외 수평전단강도 설계기준을 평가하였다.

Keywords

References

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