Journal of Korean Association for Spatial Structures (한국공간구조학회논문집)

Korean Association for Spatial Structures (한국공간구조학회)
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Shear Transfer Strength Evaluation for Ultra-High Performance Fiber Reinforced Concrete

강섬유 보강 초고성능 콘크리트의 전단 전달 모델

  • Lee, Ji-Hyung (Department of Architecture and Architectural Engineering, Seoul National University) ;
  • Hong, Sung-Gul (Department of Architecture and Architectural Engineering, Seoul National University)
  • 이지형 (서울대학교 공과대학 건축학과) ;
  • 홍성걸 (서울대학교 공과대학 건축학과)
  • Received : 2015.02.23
  • Accepted : 2015.03.23
  • Published : 2015.06.15
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Abstract

Ultra High Performance Fiber Reinforced Concrete (UHPFRC) has a outstanding tensile hardening behaviour after a crack develops, which gives ductility to structures. Existing shear strength model for fiber reinforced concrete is entirely based on crack opening behavior(mode I) which comes from flexural-shear failure, not considering shear-slip behavior(mode II). To find out the mode I and mode II behavior on a crack in UHPFRC simultaneously, maximum shear strength of cracked UHPFRC is investigated from twenty-four push-off test results. The shear stress on a crack is derived as variable of initial crack width and fiber volume ratio. Test results show that shear slippage is proportional to crack opening, which leads to relationship between shear transfer strength and crack width. Based on the test results a hypothesis is proposed for the physical mechanics of shear transfer in UHPFRC by tensile hardening behavior in stead of aggregate interlocking in reinforced concrete. Shear transfer strength based on tensile hardening behavior in UHPFRC is suggested and this suggestion was verified by comparing direct tensile test results and push-off test results.

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References

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