Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Lattice Shear Reinforcement for Slab-Column Connection Subjected to Unbalanced Moment

불균형모멘트를 받는 슬래브-기둥 접합부를 위한 래티스 전단 보강

  • Published : 2007.06.30
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Abstract

A slab-column connection is susceptible to brittle punching shear failure, which may result in the necessity of shear reinforcement. In the present study, to investigate the earthquake resistance of newly developed lattice shear reinforcement, experimental study was performed for interior slab-column connections subjected to cyclic loading. For comparison, specimens with existing shear reinforcement method such as stud rail, shear band and stirrup were also tested. The test result showed that the structural capacity of the lattice shear reinforcement was superior to those of the existing methods and was greater than the code-specified strength. On the other hand, the existing methods did not significantly improve the shear strength of the specimens. The shear strengths of the existing methods were much less than the code-specified shear strength.

무량판 구조의 슬래브-기둥 접합부는 뚫림전단파괴에 취약하여 구조 성능을 향상시킬 필요가 있다. 본 연구에서는 새로운 슬래브-기둥 접합부 전단 보강 방법인 래티스 보강의 강도와 변형 능력을 평가하기 위한 실험 연구를 실시하였다. 주기 횡 하중을 받는 4개의 래티스 보강 접합부에 대한 실험을 실시하였으며, 비교를 위하여 전단 무보강 시험체, 스터드 레일, 전단 밴드, 스터럽 등 다양한 기존의 전단 보강 방법으로 보강된 실험체에 대하여 실험을 실시하였다. 실험 결과, 래티스 보강은 강도와 변형 능력면에서 모두 우수한 성능을 나타내었으며, 현행 기준의 예측 강도를 현저히 상회하는 강도를 나타내어 전단 보강에 매우 효율적인 보강 방법으로 평가되었다. 반면에 스터럽, 스터드 레일과 전단 밴드 실험체는 전단 무보강 실험체에 비하여 강도 증진 효과가 크지 않거나, 그 강도에 미치지 못하는 강도를 나타냈다.

Keywords

References

  1. ACI-ASCE Committee Report, 'Recommendations forDesign of Slab-Column Connections in Monolithic Reinforced Concrete Structures', ACI Structural Journal, Nov. Dec., 1988, pp.675-69
  2. A. J. Durrani, Y. Du, and Y.H. Luo, 'SeismicResistance of Nonductil Slab-Column Connections in Existing Flat-Slab Building', ACI Structural Journal, Vol.92, No.4, 1995, pp.479-487
  3. Moehle, J. P., 'Strength of Slab-Column Edge Connections', ACI Structural Journal, Vol.85, No.1, 1988, pp.89-98
  4. Moehle, J. P., Kreger, M. E., and Leon, R, 'Background to Recommendations for Design of Reinforced Concrete SlabColumn Connections', ACI Structural Journal, Vol.85, No.6, 1988, pp.636-644
  5. Rosenblueth, E. andMeli,R., 'The 1985 Earthquake: Causes and Effects in Mexico City', Concrete International, Vol.8, No.5, 1986, pp.23-34
  6. 한국콘크리트학회, '콘크리트구조설계기준', 한국콘크리트학회, 2003, pp.452-455
  7. ACI Committee 318, Building Code Requirements for Structural Concrete(ACI 318-05) and Commentary(ACI 318R-05), American Concrete Institute, USA, 2004, pp.156- 160
  8. S. Unnikrishna Pillai, Wayn Kirk, and Leonard Scavuzzo,'Shear Reinforcement at Siab-Colunm Connections in a Reinforced Concrete Flat Plate', ACI Structural Journal, Vol.79, No.1, 1982, pp.36-42
  9. Carl Erik Broms, 'Elimination of Flat Plate Punching Failure Mode', ACI Structural Journal, Vol.79, No.4, 2000, pp.94-101
  10. Tetsuya Yamada, Antonio Nanni, and Katsushiko Endo, 'Punching Shear Resistance of Flat Slabs: Influence of Reinforcement Type and Ratio', ACI Structural Journal, Vol.89, No.4, 1992, pp.555-564
  11. Shafiqul Islam and Robert Park, 'Test on Slab-Column Connections with Shear and Unbalanced Flexure', Journal of Structural Engineering, ASCE, Vol.102, No.3, 1976, pp.549-568
  12. Ian N. Robertson, Tadashi Kawai, James Lee, and Brian Enomoto, 'Cyclic Testing of Slab-Column Connections with Shear Reinforcement', ACI Structural Journal, Vol.99, No.5, 2002, pp.605-613
  13. Amin Ghali and Neil Hammill, 'Effectiveness of Shear Reinforcement in Slabs', Concrete International, 1992, January, pp.60-65
  14. John D.Mortin and Amin Ghali, 'Connection of Flat Plates to Edge Column', ACI Structural Journal, Vol.88, No.2, 1991, pp.191-198
  15. E.F.EI-Salakawy, M.A.Polak, and M.H.Soliman, 'Slab-Column Edge Connections Subjected to High Moments', Canadian Journal for Civil Engineering, Vol.25, 1998, pp.526-538 https://doi.org/10.1139/cjce-25-3-526
  16. Sami Megally and Amin Ghali, 'Seismic Behavior of Edge Column-Slab Connectiions with Stud Shear Reinforcement', ACI Structural Journal, Vol.97, No.1, 2000, pp.53-59
  17. Adel A. Elgabry and Amin Ghali, 'Tests on Concrete SlabColumn Connections with Stud-Shear Reinforcement Subjected to Shear-Moment Transfer', ACI Structural Journal, Vol.84, No.5, 1987, pp.433-442
  18. Fee Kiong Lim and B. Vijaya Rangan, 'Studies on Concrete Slabs with Stud Shear Reinforcement in Voconity of Edge and Comer Colunms', ACI Structural Journal, Vol.92, No.5, 1995, pp.515-525
  19. Neil Hammill and Amin Ghali, 'Punching Shear Resistance of Comer Slab-Colunm Connections', ACI Structural Journal, Vol.91, No.6, 1994, pp.697-707
  20. K. Pilakoutas and X. Li, 'Alternative Shear Reinforcement for Reinforced Concrete Flat Slabs', Journal of Structural Engineering, Vol.129, No.9, 2003, pp.1164-1172 https://doi.org/10.1061/(ASCE)0733-9445(2003)129:9(1164)
  21. H. Park and K. Choi, 'Improved Strength Model for Interior Flat Plate-Column Connections Subject to Unbalanced Moment', Journal of Structural Engineering, ASCE, Vol.132, No.5, 2006, pp.694-704 https://doi.org/10.1061/(ASCE)0733-9445(2006)132:5(694)
  22. 안경수, 래티스 철근을 이용한 무량판-기둥 접합부의 전 단보강, 석사학위논문, 서울대학교, 2004, pp.2-3, 60
  23. 박홍근, 안경수, '래티스 철근을 이용한 무량판-기둥 접 합부의 전단보강', 콘크리트학회 논문집, 17권, 2호, 2005, pp.191-200
  24. ACI-ASCE Committee 421, 'Shear Reinforcement for Slabs(ACI 421.IR-99)', ACI, pp.10-11
  25. 박홍근, 최경규, '불균둥 휩모멘트를 받는 플랫 플레이 트-기퉁 접합부의 강도산정모텔', 콘크리트학회 논문집, 14권, 6호, 2002, pp.961-979

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