Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Static Shear Resistance of Cast-In-Place Anchors in Cracked Concrete

균열콘크리트에 매입된 선설치앵커의 정적 전단하중에 대한 저항강도

  • Park, Yong Myung (Dept. of Civil Engineering, Pusan National University) ;
  • Ju, Ho Jung (Dept. of Civil Engineering, Pusan National University) ;
  • Kim, Dong Hyun (Dept. of Civil Engineering, Pusan National University) ;
  • Kang, Moon Ki (Dept. of Civil Engineering, Pusan National University) ;
  • Lee, Jong Han (Dept. of Civil Engineering, Daegu University)
  • Received : 2014.11.19
  • Accepted : 2015.01.19
  • Published : 2015.02.27
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Abstract

In this study, an experimental study was performed to evaluate the concrete breakout strength of cast-in-place(CIP) anchors in cracked concrete under static shear loading. The CIP anchors involved in this study were 30mm in diameter with an edge distance of 150mm and an embedment length of 240mm. The experiment was carried out for two specimens in uncracked concrete and three specimens in cracked concrete orthogonal and parallel to the direction of shear loading, respectively. Compared to the uncracked concrete specimen, cracked specimen orthogonal to the direction of shear loading showed no reduction in the concrete breakout strength and that parallel to the load direction about 91% strength which corresponds to 84% of uncracked concrete strength defined in ACI 318-11. Therefore, the experimental results showed smaller decrease in the shear resistance of CIP anchors in cracked concrete than that specified in ACI code which account for 71% strength of uncracked concrete in cracked concrete.

본 연구에서는 균열콘크리트에 매입된 선설치앵커의 정적 전단하중에 대한 콘크리트 파열파괴강도 평가 실험을 수행하였다. 이를 위해 앵커 직경 30mm, 연단거리 150mm, 매입깊이 240mm인 비균열 시험체 2개와 전단하중에 수직한 방향과 평행한 방향의 균열을 모사한 시험체 각각 3개씩에 대해 실험을 수행하였다. 실험으로부터 하중 직각방향 균열 시험체는 비균열 시험체에 비해 강도의 저하가 없었으며 하중 평행 방향 균열 시험체는 91%의 강도를 보였는데, 이는 ACI 318-11의 비균열콘크리트의 저항강도의 84%에 해당하였다. 따라서 현재 ACI 318 기준에서 균열콘크리트의 저항강도를 비균열콘크리트 강도의 71%로 고려하는 것에 비해 작은 감소율을 보였다.

Keywords

References

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