Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Investigation of Shear Design Expressions of Large-Diameter Concrete-Filled Steel Tubes(CFT)

대구경 콘크리트 충전형 합성기둥의 전단 설계식 분석

  • Jung, Eun Bi (School of Architecture, Seoul National University of Science & Technology) ;
  • Yeom, Hee Jin (School of Architecture, Seoul National University of Science & Technology) ;
  • Yoo, Jung Han (School of Architecture, Seoul National University of Science & Technology)
  • 정은비 (서울과학기술대학교, 건축학부) ;
  • 염희진 (서울과학기술대학교, 건축학부) ;
  • 유정한 (서울과학기술대학교, 건축학부)
  • Received : 2015.06.09
  • Accepted : 2015.07.24
  • Published : 2015.08.27
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Abstract

Concrete filled steel tube(CFT) has outstanding deformation capacity and strength in comparison with reinforced concrete or steel tube. CFT drilled shaft, which is developed large shear force due to seismic load and soil liquefaction, is designed as large diameter. However, shear design equations of the current standards do not consider bond stress of CFT and it results in extremely conservative design. Currently, previous studies for improving shear equations scarcely exist and are impossible applied to large CFT drilled shafts since these studies focus on only small scale experimental research. In this study, eventually to propose improving shear equation of large diameter CFT, it is preliminary research to compare and investigate the previous studies and current standards.

콘크리트 충전형 합성기둥(Concrete filled steel tube, CFT)은 철근콘크리트, 강구조보다 뛰어난 변형 능력과 강도 갖고 있다. CFT 현장타설말뚝은 지진하중, 토양액상화 등에 의해 큰 국부전단력을 경험하게 되며 이를 방지하기 위해 큰 직경으로 설계되어 진다. 그러나 현행 기준의 전단 설계식은 CFT의 구속효과를 고려하지 못하고 있으며, 상당히 보수적인 설계식을 제시하고 있다. 전단 설계식의 개선을 위한 선행 전단 실험연구가 거의 없으며 그조차 소구경의 실험연구로만 존재한다. 이 연구는 대구경 콘크리트 충전형 합성기둥의 개선된 전단 설계식을 제안하기 위한 기초연구로써, 원형 CFT 기둥 전단의 선행 실험연구와 현행 설계기준 비교분석을 실행하였다.

Keywords

References

  1. Roeder, C.W., Lehman, D.E., and Bishop, E. (2010) Strength and Stiffness of Circular Concrete Filled Tubes, Journal of Structural Engineering, ASCE, Vol.136, No.12, pp.1545-1553. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000263
  2. Roeder, C.W. and Lehman, D.E. (2012) Initial Investigation of Reinforced Concrete Filled Tubes for use in Bridge Foundations, WSDOT Research Report WA-RD 776.1, Olympia, WA.
  3. ACI (2011) Building Code Requirements for Structural Concrete and Commentary, American Concrete Institute, USA.
  4. AISC (2010) Specification for Structural Steel Buildings, American Institute of Steel Construction, USA.
  5. Eurocode 4, European Committee for Standardisation, EN 1994-1-1 (2004) Design of Composite Steel and Concrete Structures, Part 1.1 General Rules and Rules for Buildings., European Union.
  6. Xu, C., Haixiao, L., and Changkui, H. (2009) Experimental Study on Shear Resistance of Self-Stressing Concrete Filled Circular Steel Tubes, Journal of Constructional Steel Research, Vol.65, No.4, pp.801-807. https://doi.org/10.1016/j.jcsr.2008.12.004
  7. Xiao, C., Cai, S., and Xu, C. (2012) Experimental Study on Shear Capacity of Circular Concrete Filled Steel Tubes, Steel and Composite Structures, An International Journal, Vol.13, No.5 pp.437-449.
  8. Nakahara, H. and Tokuda, S. (2012) Shearing Behavior of Circular CFT Short Columns, Proceedings of 10th International Conference on Advances in Steel Concrete Composite and Hybrid Structures, Singapore. pp. 362-369.
  9. 김철환, 김성은(2010) 콘크리트 충전 각형강관 주각부의 내력 및 변형에 관한 연구, 한국강구조학회논문집, 한국강구조학회, 제22권, 제3호, pp.254-260. (im, C.H. and Kim, S.E. (2010) A Study on the Behaviors of Column-to-Footing Connections for Concrete Filled Tube(CFT) System, KSSC, Vol.22, No.3, pp.253-260 (in Korean).)
  10. Roeder, C.W., Cameron, B., and Brown, C.B. (1999) Composite Action in Concrete Filled Tubes, Journal of Structural Engineering, ASCE, Vol.125, No.5, pp.477-484. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:5(477)
  11. 김승원, 김철환(2013) 데이터베이스에 의한 콘크리트충전강관(CFT)기둥의 부착강도에 대한 연구, 한국강구조학회 2013년도 학술대회논문집, 한국강구조학회, pp.255-256. (Kim, S.W. and Kim, C.H. (2013) A Study on Bond Strength Between Concrete and Steel in Concrete-Filled Steel Tube Column Based on Database, Proceedings of the 24th Annual Conference Korean Society of Steel Construction, KSSC, pp.225-256 (in Korean).)
  12. Radhika. K.S. and Baskar. K. (2012) Bond Stress Characteristics on Circular Concrete Filled Steel Tubular Columns using Mineral Admixture Metakaoline, International Journal of Civil and Structural Engineering, Vol.3, No.1, pp.1-8.
  13. Tomii, M. and Sakino, K. (1979) Elasto-Plastic Behaviour of Concrete Filled Square Steel Tubular Beam- Columns, Architectural Institute of Japan. pp.111-120.
  14. Sakino, K. and Ishibashi, H. (1985) Experimental Studies on Concrete Filled Square Steel Tubular Short Columns Subjected to Cyclic Shearing Force and Constant Axial Force, Journal of Structural and Construction Engineering, Architectural Institute of Japan, 353, pp.81-91.

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