Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Estimation of Flexural and Shear Strength for Steel Fiber Reinforced Flexural Members without Shear Reinforcements

전단보강이 없는 강섬유보강 콘크리트 휨부재의 휨 및 전단강도의 평가

  • Oh, Young-Hun (Dept. of Architectural Engineering, Konyang University) ;
  • Kim, Jeong-Hae (Dept. of Architectural Engineering, Konyang University)
  • 오영훈 (건양대학교 건축공학과) ;
  • 김정해 (건양대학교 건축공학과)
  • Published : 2008.04.30
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Abstract

Results of seventy-seven specimens tested by this study and previous research were collected and evaluated to propose the flexural strength and shear strength for flexural members with steel fiber concrete. For strength evaluation, structural parameters such as compressive strength, steel fiber content, tensile reinforcement ratio, and shear span to effective depth ratio are involved. The proposed equations for flexural and shear strength are regarded to give a good prediction for the strength of steel fiber reinforced composite and/or RC beams to compare with equations by previous researchers. Especially, the proposed shear strength equation in this study shows the lowest the mean value, the coefficient of variation and the error ratio among predictions by several equations. Therefore, equations for shear strength and flexure strength, which are proposed in this study are to be useful measure to predict the actual behavior and failure mode of steel fiber reinforced composite beams.

본 연구에서는 강섬유보강 콘크리트 휨부재에 적용할 수 있는 휨강도 산정식과 전단강도 제안식을 분석하였으며, 보다 정확성과 안전성이 향상된 전단강도 산정식이 필요한 것으로 판단되어 새로운 전단강도 제안식을 도출하였다. 휨강도 산정식은 휨파괴한 36개의 실험체를 대상으로 검토해본 결과 기존의 콘크리트보에서 무시되는 콘크리트의 인장강도를 고려하는 것이 타당한 것으로 나타났으며, 제안된 휨강도 약산식은 실험 결과와 공칭휨강도 산정식과 비교할 때 양호한 수준의 강도 예측이 가능하다고 사료된다. 또한 본 연구에서 제안한 전단강도 산정식과 기존 연구자의 전단강도 제안식을 전단파괴한 실험체의 최대강도와 비교, 검토한 결과에 의하면, 본 연구의 제안식이 정확성과 안전성을 모두 확보하면서 전단강도를 예측하는 것으로 평가되었다.

Keywords

References

  1. Ashour, S. A., Hasanain, G. S., and Wafa, F. F., "Shear Behavior of High-Strength Fiber Reinforced Concrete Beams", ACI Structural Journal, Vol.89, No.2, 1992, pp.176-184
  2. Mansur, M. A., Ong, K. C. G., and Paramasivam, P., "Shear Strength of Fibrous Concrete Beams without Stirrups", Journal of Structural Engr., ASCE., Vol.112, No.9, 1986, pp.2066-2079 https://doi.org/10.1061/(ASCE)0733-9445(1986)112:9(2066)
  3. Narayanan, R. and Darwish, I. Y. S., "Use of Steel Fibers as Shear Reinforcement", ACI Structural Journal, Vol.84, No.3, 1987, pp.216-227
  4. Sharma, A. K., "Shear Strength of Steel Fiber Reinforced Concrete Beams", ACI Journal, Proceedings, Vol.83, No.4, 1986, pp.624-628
  5. Swamy, R. N., Jones, R., and Chiam, A. T. P., "Influence of Steel Fibers on the Shear Resistance of Lightweight Concrete I-beams", ACI Structural Journal, Vol.90, No.1, 1993, pp.103-114
  6. Kwak, Y. K., Eberhard, M., Kim, W. S., and Kim, J., " Shear Strength of Steel Fiber-Reinforced Concrete Beams without Stirrups", ACI Structural Journal, Vol.99, No.4, 2002, pp.530-538
  7. 김우석, 백승민, 이정석, 권진환, 곽윤근, "강섬유보강 콘 크리트보의 휨내력에 관한 연구", 대한건축학회 논문집, 18권, 9호, 2002, pp.3-11
  8. 김우석, 곽윤근, 김주범, "강섬유보강 콘크리트보의 휨내 력 예측식의 제안", 콘크리트학회 논문집, 18권, 3호, 2006, pp.361-370 https://doi.org/10.4334/JKCI.2006.18.3.361
  9. 오병환, 이형준, 백신원, 임동환, "강섬유 보강 콘크리트 의 강도 및 역학적 특성 연구", 한국콘크리트학회, 가을 학술발표논문집, 2권, 2호, 1990, pp.175-178
  10. Khuntia, M., Behavior of Fiber Reinforced Concreteencased Composite Members under Monotonic and Reversed Cyclic Loading, Ph.D. Thesis, Univ. of Michigan, 1998, 210pp
  11. ACI, Building Code Requirements for Reinforced Concrete, ACI Committee 318, 2002, 113pp
  12. 오영훈, 남영길, 김정해, "전단보강근이 없는 강섬유보강 합성보의 강도 및 연성능력", 콘크리트학회 논문집, 19 권, 1호, 2007, pp.103-111 https://doi.org/10.4334/JKCI.2007.19.1.103
  13. Li, V., Ward, R., and Hamza, A. M., "Steel and Synthetic Fibers as Shear Reinforcement", ACI Materials Journal, Vol.89, No.5, 1993, pp.499-508

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