콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제17권5호
  • /
  • Pages.717-726
  • /
  • 2005
  • /
  • 1229-5515(pISSN)
  • /
  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
권호 표지
DOI QR코드

DOI QR Code

철근콘크리트 보와 프리스트레스트 콘크리트 보의 전단설계기준에 대한 고찰

Evaluation of Shear Design Provisions for Reinforced Concrete Beams and Prestressed Concrete Beams

  • Kim Kang-Su (Dept. of Architectural Engineering, The University of Seoul) ;
  • Kim Sang-Sik (Dept. of Architectural Engineering, Inha University)
  • 발행 : 2005.10.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

본 논문에서는 기존의 전단실험결과를 모아 구축한 방대한 데이터베이스를 이용하여 철근콘크리트 보와 프리스트레스트 콘크리트 보에 대한 ACI와 국내의 전단설계기준을 평가 분석하였다. 또한 두 전단설계기준에 대한 평가결과를 바탕으로 기준의 안전율과 강도감소계수에 대하여도 고찰하였다. 전단설계기준은 철근콘크리트 부재의 전단강도에 대해서 매우 낮은 정확도를 보였으며, 특히 전단철근이 없는 철근콘크리트 보의 전단강도에 대하여 가장 낮은 정확도를 제공하였다. 또한 기준에서 전단강도에 대한 전단철근의 기여도의 제한은 다소 낮은 것으로 분석되었으며, 특히 전단철근이 없고 휨인장철근비가 낮으며$(\rho_w<1.0\%)$ 춤이 높은 (h>700mm) 보에 대하여 매우 위험한 전단강도를 제공하였다. 프리스트레스트 콘크리트 부재에 대해서는 철근콘크리트 부재에 비하여 매우 정확한 전단강도를 제공하였다. 그러나, ACI와 국내의 전단설계기준은 전단강도의 예측정확도가 매우 다른 철근콘크리트 부재와 프리스트레스트 콘크리트 부재에 대해 동일한 강도감소계수를 사용함으로써 이들 부재에 대해 동일한 수준의 설계안 전율을 제공하지 못하였다.

Shear test data have been extracted from previous experimental research and compiled into a database that may be the largest ever made. In this paper, the shear database (SDB) was used for evaluating shear design provisions for both reinforced concrete (RC) beams and prestressd concrete (PSC) beams. A discussion on the use of the results of this evaluation related to calibration and strength reduction factor for the shear design provisions was also provided. It was observed that the shear design provisions did not provide good predictions for RC members and gave very poor predictions especially for RC members without shear reinforcement. On the other hand, the limit on shear strength contributed by transverse reinforcement was observed to be lower than necessary. The shear design provisions gave very unconservative results for the large RC members (d>700mm) without shear reinforcement having light amount of longitudinal reinforcement $(\rho_w<1.0\%)$. However, for PSC members the shear design provisions gave a good estimation of ultimate shear strength with a reasonable margin of safety. Despite of a large difference of accuracy in prediction of shear strength for RC members and PSC members, the shear design provisions used a same shear strength reduction factor for these members. As a result, the shear design provisions did not provide a uniform factor of safety against shear failure for different types of members.

키워드

참고문헌

  1. ACI Committee 318, 'Building Code Requirements for Structural Concrete (ACI 318-02) and Commentary (ACI 318 R-02)', American Concrete Institute, Farmington Hills, 2002, 443pp
  2. Kani, G. N. J., 'Basic Facts Concerning Shear Failure', ACI Journal, Proceedings Vol.63, No.6, June 1966, pp.675-692
  3. Collins, M P. and Kuchma, D. A, 'How Safe Are Our Large, Lightly Reinforced Concrete Beams, Slabs, and Footings?' ACI Structural Journal, Vol. 96, No.4, Jul.-Aug. 1999, pp.482-490
  4. Angelakos, D., Bentz, E. C, and Collins, M. P, 'The Effect of Concrete Strength and Minimum Stirrups on the Shear Strength of Large Members', ACI Structural Journal, Vol.98, No.3, 2001, pp. 200-300
  5. Reineck, K. H, Kuchma, D. A., and Kim, K. S., Marx, S., 'Shear Database for Reinforced Concrete Members without Shear Reinforcement', ACI Structural Journal, Vol.100, No.2, Mar.-Apr., 2003, pp.240-249
  6. K. S. Kim, 'Shear Behavior of Reinforced Concrete Beams and Prestressed Concrete Beams', Ph.D. Dissertation, Dept, of Civil and Environmental Engineering, University of Illinois at UrbanaChampaign, 2004, 475pp
  7. 한국콘크리트학회, 콘크리트구조설계기준. 해설, 한국콘크리트학회, 2000. 9, 413pp
  8. Nawy, E. G., Prestressed Concrete: A Fundamental Approach, Prentice Hall, Upper Saddle River, New Jersey, 3rd ed, 1999, 938pp
  9. ACI Committee 318, 'Commentary on Building Code Requirements for Reinforced Concrete (ACI 318-63)', SP-10, American Concrete Institute, Detroit, 1935, pp.78-84
  10. Sozen, M. A, Zwoyer, E. M, and Siess, C. P., Strength in Shear of Beams without Web Reinforcement, Urbana, Illinios Bulletin No. 452, Engineering Experiment Station, University of Illinois, April 1959
  11. Kuchma, D. A. and Kim, K. S., 'Stress Limits and Minimum Reinforcement Requirements in Shear Design Provisions', Progress in Structural Engineering and Materials, Vol.3, No.4, 2001, pp.317-325 https://doi.org/10.1002/pse.94
  12. Moody, K. G,, Viest, I. M,, Elstner, R. C., and Hognestad, E., 'Shear Strength of Reinforced Concrete Beams, Part-1: Tests of Simple Beams', Journal of the American Concrete Institute, Vol.51 , No.4, 1954, pp.317 -333
  13. Yoon, Y. S., Cook, W. D., and Mitchell, D., 'Minimum Shear Reinforcement in Normal, Medium, and High-Strength Concrete Beams', ACI Structural Journal, Vol.95, No.5, 1996, pp.576-584
  14. Collins, M. P. and Kuchma, D., 'How Safe Are Our Large, Lightly Reinforced Concrete Beams, Slabs, and Footings?' ACI Structural Journal, Vol.96, No. 4, 1999, pp.482-490
  15. Angelakos, D,, Bentz, E. C., and Collins, M. P., 'The Effect of Concrete Strength and Minimum Stirrups on the Shear Strength of Large Members', ACI Structural Journal, Vol.98, No.3, 2001, pp.290-300
  16. Kani, G. N. J, 'How Safe Are Our Large Reinforced Concrete Beams', ACI Journal Proceedings, Vol.64, Mar. 1967, pp.128-141
  17. Bazant, Z. P. and Kim, J. K, 'Size Effect in Shear Failure of Longitudinally Reinforced Beams', ACI Structural Journal, Vol.81, No.5, Sen.-Oct, 1984, pp. 456-468
  18. Bazant, Z. P. and Sun, H. H., 'Size Effect in Diagonal Shear Failure: Influence of Aggregate Size and Stirrups', ACI Structural Journal, Vol.84, No.4, 1987, pp.259-272
  19. Shioya, T., Shear Properties of large reinforced concrete member, Special Report of Institute of Technology, Shimizu Corporation, No.25, 1989, 198pp
  20. Elstner, R.C. and Hognestad, E., 'Laboratory Inverstigation of Rigid Frame Failure', ACI Journal, Jan. 1957, pp.637-668
  21. Collins, M. P. and Kuchma, D. A, 'Advances in Understanding Shear Performance of Concrete Structures', Progress in Structural Engineering and Materials, Vol.1, No.4, 1998, pp.1-10 https://doi.org/10.1002/pse.2260010103
  22. JSCE, Specification for Design and Construction of Concrete Structures: Design, JSCE Standard, Part 1, Japan Society of Civil Engineers, Tokyo, 1986
  23. AASHTO, AASHTO LRFD Bridge Design Specifications, American Association of State Highway and Transportation Officials, 2nd ed, Washington, DC, 1998, 1116pp. Including interim revisions for 1999 through 2003
  24. MacGregor, J. G., Reinforced Concrete: Mechanics and Design, Prentice Hall, Englewood Cliffs, New Jersey, 3rd ed, 1997, 939pp
  25. AASHTO, Standard Specifications for Highwqy Bridges, American Association of State Highway and Transportation Officials, Washington, DC, 2002, 722pp