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Strength Model for Punching Shear of Flat Plate-Column Connections

플랫플레이트-기둥 접합부의 뚫림전단강도

  • Published : 2004.04.01

Abstract

A number of experiments were performed to investigate the punching shear strength of flat plate-column connections. According to the experiments, the punching shear strength varies significantly with design parameters such as the column size of the connection, reinforcement ratio, and boundary condition. However, current design methods do not properly address the effects of such design parameters. In the present study, a theoratical approach using Rankine's failure cirterion was attempted to define the failure mechanism of the punching shear According to the study, the failure mechanism can be classified into the compression-controlled and the tension-controlled, depending on the amount of bottom re-bars placed at the connection, and the punching shear strength is also significantly affected by the flexural damage of slab. Based on the finding, a new strength model of punching shear was developed, and verified by the comparisons with existing experiments and nonlinear finite element analyses. The comparisons show that the proposed strength model addressing the effects of various design parameters can predict accurately the punching shear strength, compared to the existing strength models.

플랫플레이트-기둥 접합부의 뚫림전단강도를 규명하기 위해 그동안 많은 실험연구가 수행되어 왔다. 실험결과에 의하면, 뚫림전단강도는 접합부의 기둥크기, 철근비, 경계조건 등 다양한 설계변수에 따라 크게 변화하는 것으로 나타났다. 하지만 현행 설계기준들은 설계변수의 영향을 정확히 반영하고 있지 못한 실정이다. 본 연구에서는 뚫림전단의 파괴메카니즘을 정의하기 위하여, Rankine의 파괴기준을 이용하는 구조역학적 접근법이 사용되었다. 파괴메카니즘은 접합부에 배치된 하부철근량에 따라 압축지배 전단파괴와 인장지배 전단파괴로 분류되며, 또한 뚫림전단강도는 슬래브의 휨손상에 밀접한 영향을 받는 것으로 밝혀졌다. 이 연구결과에 근거하여 콘크리트의 뚫림전단강도식을 개발하였으며, 제안된 방법은 기존 실험연구결과와 비선형 수치해석결과와의 비교를 통해 타당성이 검증되었다. 비교결과, 다양한 설계변수의 영향을 반영하고 있는 제안된 강도모델은, 현행 설계기준보다 접합부의 뚫림전단강도를 정확히 추정할 수 있는 것으로 밝혀졌다.

Keywords

References

  1. 한국콘크리트학회, '콘크리트구조 설계기준', 한국콘크리트학회, 1999, pp.154-160
  2. American Concrete Institute, 'Building Code Requirements for Structural Concrete,' ACI318-02. pp.184-186,
  3. BS 8110, 'Structural use of concrete, Part l, Code of practice for design and construction,' British Standards Institution, London, 1997
  4. CEB-FIP Model Code 1990, 'Comite Euro-International du. Beton,' Lausanne, 1993
  5. Elstner, R. C. and Hognestad, E., 'An Investigationof Reinforced Concrete Slabs Failing in Shear,'Mineographed Report, University of Illinois, Department of Theoretical and Applied Mechanics,Mar, 1963, PP.15-68
  6. David, Z. Y. and Orit L., 'Punching shear inconcrete slabs,' International Journal of Mechanical Science, Vol.41, 1999, PP.1-15 https://doi.org/10.1016/S0020-7403(97)00086-6
  7. Nielsen, M. R., 'Limit Analysis and ConcretePlasticity,' 2th Ed., CRC Press, New York, 1999,pp.306-328
  8. Alexander, S. D. B. and Simmonds, S. H., 'UltimateStrength of Slab-Column Connections,' ACI Structural Journal, Vo1.84, May-Jun. 1987, PP.255-261
  9. Johansen, K. W., 'Yield-Line Theory,' Cement andConcrete Association, London, 1962
  10. 최경규, 황영현, 박홍근, '불균등 휨모멘트를 받는 플랫 플 레이트-기둥 내부 접합부의 강도에 대한 해석연구', 콘크리트학회논문집, 14권 6호, 2002, pp.949-960
  11. Farhey, D. N., Yankelevsky, D. Z., and Adin, MosheA., 'Resistance Mechanism Model for ReinforcedConcrete Flat Slab-Column Frame Connections, ACI Structural Journal, Vol.94, No.6, Nov.-Dec.,1997, pp. 653-662
  12. Chen, W. R., 'Plasticity in reinforced concrete,'McGraw-Hill, New York, 1982, PP.204-205
  13. Rapheal, J. M., 'Tensile Strength of Concrete,' ACIJournal, Vol.8l, No.2, Mar.-Apr., 1984, PP.158-165
  14. 최경규, 박홍근, '불균등 휨모멘트를 받는 플랫플레이트-기둥 접합부의 강도산정모델', 콘크리트학회논문집, 제14권 6호, 2002, pp.961-972.13. Rapheal, J. M.,'Tensile Strength of Concrete,' ACI Journal, Vol.81,No.2, Mar.-Apr., 1984, PP.158-165
  15. Vanderbilt. M. D., 'Shear Strength of ContinuousPlates,' Journal of Structural Division, ASCE, Vol.98, No.ST5, May 1972, PP.961-973
  16. Moe, J., 'Shearing Strength of Reinforced Concrete Slabs nd Footings under Concerntrated Loads,'Development Department Bulletin D47, Portland Cement Association, Illinois, April, 1961, pp.68-100
  17. Richart, F. E., 'Reinforced Concrete Wall and Column Footings,' ACI Journal, Vol.45, Oct.-Nov.,1948, pp.97-127, 237-260

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