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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
권호 표지
DOI QR코드

DOI QR Code

Code Change for using the High-Strength(550 MPa) Headed Deformed Bars of Large-Sized Diameter(57 mm) in Concrete Containments

대구경(57 mm) 및 고강도(550 MPa) 확대머리 철근의 콘크리트 격납구조물 적용을 위한 코드개정에 관한 연구

  • 이병수 (한수원중앙연구원 플랜트건설기술연구소) ;
  • 임상준 (한수원중앙연구원 플랜트건설기술연구소) ;
  • 윤현도 (충남대학교 건축공학과)
  • Received : 2017.09.13
  • Accepted : 2017.09.19
  • Published : 2017.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

Generally, significant amount of reinforcements are used in nuclear power plant structures and it may cause several potential problems during the construction. In particular, it is more difficult to pour concrete into structural member joint area than other areas because of the significant congestion of the joint area due to a lot of hooked bars, embedded materials, and other reinforcements. The purpose of this study is to solve these problems due to the reinforcement congestion by using the high-strength(ASTM A615 Gr.80) headed deformed bars of large-sized diameter(43 mm & 57 mm) in nuclear power plant structures as a alternative of standard hooked bars. In order to use headed deformed bars effectively, It is necessary to find the method how to relax limits on their use while maintaining or improving the anchorage capacity. Therefore, this study will analyze the results of tests planned to evaluate the influence of the restricted variables, such as bar size, yield strength, clear cover thickness.

일반적으로, 원전구조물은 다량의 철근이 사용되어 시공과정에서 여러 잠재적 문제점이 발생한다. 특히, 구조부재의 연결부위는 수많은 갈고리철근, 매입철물과 주변 철근 등에 의해 심각한 과밀현상이 발생하므로 여타 다른 부위보다 콘크리트 타설에 더 큰 어려움이 야기된다. 원전구조물에 사용되는 일반강도(ASTM A615 Gr.60)의 대구경(43 mm & 57 mm) 표준갈고리 철근을 대신하여 고강도(ASTM A615 Gr.80)의 대구경(43 mm & 57 mm) 확대머리 철근을 사용할 수 있도록 관련 기술기준을 개정하여 철근 과밀배근 문제를 해결하는 데 본 연구의 목적이 있다. 확대머리 철근을 원전구조물에 효과적으로 사용하기 위해서는 기존의 정착성능을 그대로 유지하거나 그 이상으로 증가시키면서 사용 제한요건을 완화는 방안을 찾아야 하므로 철근직경, 철근 항복강도, 측면피복 두께와 같이 확대머리 철근의 사용을 제한하는 변수 영향을 검토할 수 있는 실험결과를 분석하여 정착성능을 평가하였다.

Keywords

References

  1. ACI Committee 318 (2008), Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary, American Concrete Institute, Farmington Hills, 203-212.
  2. ACI Committee 349 (2013), Code Requirements for Nuclear Safety-Related Concrete Structures(ACI 349-13) and Commentary, American Concrete Institute, Farmington Hills, 72-75.
  3. ASME Boiler and Pressure Vessel Committee on Nuclear Power (2015), Sec.III. Div.2 - Code for Concrete Containments, The American Society of Mechanical Engineers, The American Society of Mechanical Engineers, New York, 62-66.
  4. Bae, M. S., Chun, S. C., and Kim, M. G. (2016), Behavior of 550 MPa 43 mm Hooked Embeded in Beam-Column Joints, KCI Journal, Korea Concrete Institute, 28(5), 611-620. https://doi.org/10.4334/JKCI.2016.28.5.611
  5. Bashandy, T. R. (1996), Application of Headed Bars in Concrete Members, phD dissertation, The University of Texas at Austin, Austin, 291-298.
  6. Choi, C. M. (2014), Strength of Headed Bars Anchored in Exterior Beam-Column Joints, Master' Thesis, Mokpo National University, Mokpo, 24-66.
  7. Chun, S. C. (2015), Lap Splice Tests Using High- Strength Headed Bars of 550 MPa(80 ksi) Yield Strength, ACI Structural Journal, American Concrete Institute, 112(5), 679-688.
  8. Chun, S. C., Choi, C. S., and Jung, H. S. (2017), Side-Face Blowout Failure of Large-Diameter High-Strength Headed Bars in Beam-Column Joints, ACI Structural Journal, American Concrete Institute, 114(1), 161-172.
  9. Chun, S. C., Choi, C. S., and Lee, B, S. (2015), Side-Face Blowout Strength of 43 and 57 mm (No. 14 and No. 18) Hooked Bars in Beam-Column Joints, ACI Structural Journal, American Concrete Institute, 114(NO5), 1-12.
  10. Chun, S. C. and Lee, J. G. (2013), Strength of Lap Splices Anchored by SD600 Headed Bars, KCI Journal, Korea Concrete Institute, 25(2), 217-224. https://doi.org/10.4334/JKCI.2013.25.2.217
  11. DeVries, R. A. (1999), Anchorage Capacity in Concrete of Headed Reinforcement with Shallow Embedments, ACI Structural Journal, American Concrete Institute, 96(5), 728-736.
  12. DeVries, R. A. (1996), Anchorage of Headed Reinforcement in Concrete, phD dissertation, The University of Texas at Austin, Austin, 278-286.
  13. DeVries, R. A., Jirsa J. O., and Bashandy, T. (1998), SP 180-16 : Effect of Transverse Reinforcement and Bonded Length on the Side-Blowout Capacity of Headed Reinforcement, American Concrete Institute, Farmington Hills, 367-389.
  14. Hong, J. S. (2013), Evaluation on Anchorage Capacity of Headed Bars with Large Diameter in TTC Node, Hanyang University, Seoul, 32-70.
  15. Jung, H. S. (2016), Evaluation on Anchorage Capacity of Large-Diameter Headed Bars with High-Strength, phD dissertation, Hanyang University, Seoul, 32-100.
  16. KHNP-Central Research Institute (2016), Technical Report 2017-5000- 3339-전-0077TR : Development of Application Technology of High-Strength Reinforcing Bars for Nuclear Power Plant Structures, Korea Hydro & Nuclear Power Co., LTD, Daejeon, 52-73.
  17. Kim, K. J. (2015), Numerical Approach of Effect of Transverse Reinforcement on Headed Bars with Large Diameter in TTC Node, Master' Thesis, Hanyang University, Seoul , 5-35.
  18. Korea Electric Power Industry Code Structural T/C (2015), SNB-Nuclear safety Related Structures-Concrete Containments, Korea Electric Association, Seoul, 86-92.
  19. Korea Electric Power Industry Code Structural T/C (2015), SNCNuclear safety Related Structures-Nuclear Safety-Related Concrete Structures, Korea Electric Association, Seoul, 91-100.
  20. Lee, J. G. (2013), Strength of Lap Splices Anchored by SD 600 Headed Bars, Master' Thesis, Mokpo National University, Mokpo, 22-57.
  21. Lee, S. Y. (2014), Strength of Lap Splices Anchored by Large Diameter Headed Bars, Master' Thesis, Mokpo National University, Mokpo, 67-68.
  22. Marques, J. L. G., and Jirsa, J. O. (1975), A Study of Hooked Bar Anchorages in Beam-Column Joints, ACI Journal, American Concrete Institute, 72(3), 198-209.
  23. Thompson, M. K., Jirsa, J. O., and Breen, J. E. (2006), Behavior and Capacity of Headed Reinforcement, ACI Structural Journal, American Concrete Institute , 103(4), 522-530.
  24. Thompson, M. K., Jirsa, J. O., and Breen, J. E. (2006), CCT Nodes Anchored by Headed Bars. Part 2 : Capacity of Nodes, ACI Structural Journal, American Concrete Institute, 103(1), 65-73.
  25. Thompson, M. K., Ledesma, A., Jirsa, J. O., and Breen, J. E. (2006) Lap Splices Anchored by Headed Bars, ACI Structural Journal, American Concrete Institute, 103(2), 271-279.
  26. Thompson, M. K., Ziehl, M. J., Jirsa, J. O., and Breen, J. E. (2005), CCT Nodes Anchored by Headed Bars. Part 1 : Behavior of Nodes, Structural Journal, ACI, 102(6), 808-815.