• Title/Summary/Keyword: 비보강 앵커

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Shear Resistance of CIP Anchors under Dynamic Loading: Unreinforced Anchor (선설치앵커의 동적 전단하중에 대한 저항강도: 비보강 앵커)

  • Park, Yong Myung;Kang, Moon Ki;Kim, Dong Hyun;Lee, Jong Han;Kang, Choong Hyun
    • Journal of Korean Society of Steel Construction
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    • v.26 no.1
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    • pp.11-20
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    • 2014
  • The Concrete Capacity Design(CCD) method has been used in the design of anchor since 2001 and Korean design code specify that concrete breakout capacity of CIP anchor under seismic load shall be taken as 75% of static capacity. In this study, an experimental study was performed to evaluate the concrete breakout capacity of unreinforced CIP anchors under dynamic shear force. For the purpose, three static and dynamic shear-loading tests were conducted using 20mm diameter anchors, respectively. The edge distance of 120mm was considered in the tests. In the dynamic tests, 15 cycles pulsating load with 1Hz speed was applied and the magnitude of loading step was increased until concrete breakout failure occurs. From the tests, the concrete breakout capacity under dynamic shear loading showed nearly same capacity by static loading.

Shear Resistance of CIP Anchors under Dynamic Loading: Reinforced Anchor (선설치앵커의 동적 전단하중에 대한 저항강도: 철근보강 앵커)

  • Park, Yong Myung;Kang, Moon Ki;Roh, Jin Kyung;Ju, Ho Jung;Kang, Choong Hyun
    • Journal of Korean Society of Steel Construction
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    • v.26 no.1
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    • pp.21-30
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    • 2014
  • In this study, an experimental study was performed to evaluate the shear resistance of cast-in-place(CIP) anchors reinforced with hairpin and stirrup bars under static and dynamic loads. The reinforcement was developed using D6 bars, and the anchors were installed with 20mm diameter and 120mm edge distance. Three tests were conducted for each type of reinforced anchor under static and dynamic shear load with a pulsating frequency of 1 Hz, respectively. It was found that the strength of hairpin-reinforced anchor was affected by the concrete cover and the dynamic tests showed no capacity reduction of anchors compared with static tests. The stirrup-reinforced anchor showed little increase of resistance compared with unreinforced anchor and the resistance under dynamic loading showed nearly same strength by static loading.

Shear Resistance of Unreinforced Cast-In-Place Anchors in Uncracked and Cracked Concrete by Seismic Qualification Tests (지진모의실험에 의한 비균열 및 균열콘크리트에 매입된 비보강 선설치앵커의 전단 저항강도 평가)

  • Park, Yong Myung;Kim, Tae Hyung;Kim, Dong Hyun;Jo, Sung Hoon;Lee, Jong Han
    • Journal of Korean Society of Steel Construction
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    • v.27 no.3
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    • pp.347-357
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    • 2015
  • In this study, an experimental study was performed to evaluate the concrete breakout strength of unreinforced cast-in-place anchors by seismic qualification test under shear loading. The CIP anchors tested herein were 30mm in diameter with an edge distance of 150mm and an embedment depth of 240mm in uncracked and cracked concrete. The cracked specimen consisted of orthogonal and parallel crack to the loading direction, respectively. The dynamic loading sequence during the seismic qualification test was determined based on CSA N287.2, ACI 355.2 and ETAG 001 codes. After the dynamic loading, the static loading was applied until failure occurs. The shear resistance by seismic qualification tests showed almost the same strength as that obtained from the static tests in uncrcaked and cracked concrete, respectively. Meanwhile, the breakout depth did not reach $8d_0$, therefore the modified strength equation of ACI 318-11 could estimate properly the concrete breakout strength, which does not consider effective bearing length.

A Study on the Strength and the Deformation Capacity of RC Beams Strengthened with Aramid Fiber Sheet (아라미드 섬유쉬트로 휨보강한 RC보의 강도성능 및 변형성능에 관한 고찰)

  • 이현호;구은숙
    • Magazine of the Korea Concrete Institute
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    • v.10 no.5
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    • pp.151-158
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    • 1998
  • 최근 들어 구조물을 보강하는 방법으로 강판 또는 섬유쉬트를 외부에 부착시키는 공법이 많이 사용되고 있다. 섬유쉬트 중에서 가장 널리 사용되는 것은 탄소섬유쉬트이지만, 성능면에서 뒤지지 않고 가격면에서는 오히려 유리한 아라미드섬유쉬트에 관한 연구는 전무한 실정이다. 본 연구에서는 아라미드섬유쉬트로 휨보강한 RC보의 파괴양상 및 강도성능, 변형성능을조사하고, 여섯 개의 보강변수에 대한 보강효과를 조사하였다. 인장철근비, 보강길이, 보강겹수, 앵커볼트 정착 유무가 각각 다른 16개의 실험체와 밑면 마감처리 및 부재손상 여부가 다른 2개의 실험체, 그리고 이들 보강 실험체의 비교 근거가 되는 비보강 실험체 2개를 실험하여 그 특성을 연구하였다. 실험결과, 보강성능과 파괴양상에 가장 큰 영향을 미치는 변수는 보강길이로 나타났다. 보강겹수도 어느 정도의 영향을 미치는 것으로 나타났으나 그외 다른 변수들의 영향은 미비한 것으로 판단된다.