한국구조물진단유지관리공학회 논문집 (Journal of the Korea institute for structural maintenance and inspection)

  • 제15권4호
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  • Pages.221-231
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  • 2011
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  • 2234-6937(pISSN)
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  • 2287-6979(eISSN)
한국구조물진단유지관리공학회 (Korea Institute for Structural Maintenance Inspection)
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UHPC 바닥판 슬래브의 뚫림전단강도

Punching Shear Strength of Deck Slabs Made of Ultra High Performance Concrete

  • 투고 : 2011.06.02
  • 심사 : 2011.07.11
  • 발행 : 2011.07.30
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초록

강섬유보강 초고성능 콘크리트(UHPC)는 압축강도가 200MPa에 이르고, 강성 및 인성이 크기 때문에 이를 이용하면 구조 부재를 얇고 가볍게 설계하는 것이 가능하다. 본 논문은 UHPC를 교량의 바닥판 슬래브에 적용하기 위해서 뚫림전단(punching shear)에 대한 저항능력을 평가한 것이다. 6개의 정사각형 슬래브를 제작하여 4변 완전고정 상태에서 뚫림전단 실험을 수행하였다. 슬래브의 두께는 40mm와 70mm였고, 재하판의 형상비는 1.0~2.5 범위였다. 40mm 실험체는 최대하중 이후에 연성적인 변형률 연화구간이 길고, 70mm 실험체는 상대적으로 더 취성적인 뚫림파괴를 보였다. 기존의 여러 뚫림전단강도 평가식을 이용하여 실험결과를 분석하였는데, 두께가 작은 40mm 실험체에서는 Ductal$^{(R)}$ 및 JSCE의 식이, 그리고 70mm 실험체에서는 Harajli et al. 및 ACI-Ductal$^{(R)}$의 제안식이 상대적으로 실험에 근접한 값을 예측하였다. 그러나 전반적으로 실험결과를 잘 예측하지 못하였으므로 실제 파괴메커니즘에 근거한 새로운 식을 제안하였다. 새로 제안한 식은 실험결과를 비교적 잘 예측하는 것으로 나타났다.

Thinner and lighter structural members can be designed by utilizing the high stiffness and toughness, and high compressive strength of UHPC(ultra high performance concrete), which reaches up to 200MPa. The punching shear capacity of UHPC was investigated in this paper aiming for the application of UHPC to bridge decks. Six square slabs were fabricated and punching shear test was performed under fixed boundary condition. Different thicknesses of test slabs, which were 40mm and 70mm, were selected. The shape ratio of loading plates were ranged between 1.0~2.5. 40mm thickness slabs showed longer softening region after the peak load and, on the other hand, 70mm thickness slabs revealed a more brittle shear failure. Experimental results were analyzed using various existing punching shear predicting equations. Ductal$^{(R)}$ equation and JSCE equation better predicted for 40mm slabs, and Harajli et al. equation and ACI-Ductal$^{(R)}$ equation better suited for 70mm slabs. Nevertheless generally they didn't well predict the test results. A new punching shear equation which was derived based on the actual failure mechanism was proposed. The proposed equation appeared to better predict the punching shear strength of UHPC than other available equations.

키워드

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피인용 문헌

  1. Estimation of Punching Shear Strength for Ultra High Performance Concrete Thin Slab vol.15, pp.2, 2015, https://doi.org/10.9712/KASS.2015.15.2.095
  2. Tensile Stress-Crack Opening Relationship of Ultra High Performance Cementitious Composites(UHPCC) Used for Bridge Decks vol.17, pp.1, 2013, https://doi.org/10.11112/jksmi.2013.17.1.046
  3. Experimental study of concrete decks restrained by steel strap vol.167, pp.10, 2014, https://doi.org/10.1680/stbu.12.00051
  4. Structural Behavior of Steel Fiber-Reinforced Concrete Beams with High-Strength Rebar Subjected to Bending vol.20, pp.3, 2016, https://doi.org/10.11112/jksmi.2016.20.3.093
  5. Structural Design of Ultra High-Strength Concrete Non-Uniform Truss Using Strut-Tie Approach vol.18, pp.2, 2018, https://doi.org/10.9712/KASS.2018.18.2.69
  6. Steel Strap으로 횡구속된 무철근 바닥판의 정적 및 피로거동 특성 연구 vol.16, pp.5, 2011, https://doi.org/10.11112/jksmi.2012.16.5.137
  7. 100, 120 MPa급 고강도 콘크리트 적용 바닥판 적정두께 결정을 위한 실험적 연구 vol.33, pp.4, 2011, https://doi.org/10.14346/jkosos.2018.33.4.38