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지간-높이 비에 따른 스트럿-타이 모델과 ACI 고전적인 방법의 설계 비교

Design Comparison of Strut Tie Model and ACI Traditional by Clear Span-to-Depth Ratio

  • Lymei, Uy (Dept. of Civil and Environmental Engineering, Konyang University) ;
  • Son, Byung-Jik (Dept. of Civil and Environmental Engineering, Konyang University)
  • 투고 : 2013.10.07
  • 심사 : 2013.04.10
  • 발행 : 2014.04.30

초록

깊은 보는 지간-높이 비가 중요한 파라미터이다. 깊은 보를 설계할 때, ACI 318-02 이후 버전에서는 응력의 비선형 분포로 인해서 고전적인 설계 방법이 아니라 스트럿-타이 모델을 부록에 수록하여, 이 방법으로 설계하도록 하고 있다. 본 연구에서는 ACI 고전적인 설계방법과 스트럿-타이 모델을 비교, 분석하였다. 파라미터 연구로 지간-높이 비를 변화시켰으며, 총 68개의 샘플을 분석하였다. 결과로 고전적인 설계 방법과 스트럿-타이 모델은 빔의 지간-높이 비에 따라서 각각 장단점이 있으며, 본 논문에 깊은 보를 설계할 때의 팁이 제시되어 있다.

Since clear span-to-depth ratio is used to define what is so called a deep beam, it is an important parameter ratio for study about deep beam. Deep beams can be designed by flexure design method, and shear provided by concrete ($v_c$) and by steel ($v_s$) for deep flexure members are provided in ACI 318-99 [1]. But in later version of ACI (from ACI 318-02) it is not provided and deep beams shall be designed either by taking into account nonlinear distribution of strain or by Appendix A of Strut-and-Tie Models (STM). The trend of deep beam design seems to be familiar with strut-and-tie model, but ACI traditional design is not forgotten. By comparing these two method, there should a point which definitely explain the different between the two methods. In this study, 68 samples result of steel, after reinforcement arrangement, are taken to be analyzed.

키워드

참고문헌

  1. ACI Committee 318, 1999, "Building Code Requirements for Structural Concrete (ACI 318M-99) and Commentary (318RM-99)", American Concrete Institute, Farmington Hills, pp.163-164, 1999.
  2. ACI Committee 318, 2011, "Building Code Requirements for Structural Concrete (ACI 318M-11) and Commentary (318RM-11)", American Concrete Institute, Farmington Hills, pp. 387-401, 2011.
  3. James K. Wight and James G. MacGregor, Reinforced Concrete Mechanics and Design, Pearson, Six Edition, pp. 879-971, 2012.
  4. James K. Wight and Gustavo J. Parra-Montesinos, Strut-and-Tie Model for Deep Beam Design, Concrete International.
  5. Karl-Heinz Reineck and Lawrence C. Novak, Further Examples for the Design of Structural Concrete with Strut-and-Tie Models, 2011.
  6. Verification and implementation of strut-and-tie Model in LRFD Bridge design Specifications, barney T. Martin, Jr., Phd., P.E., November, 2007.
  7. ACI Structural journal, Design of deep beams suing strut-and-tie models part I&II, Michael D. Brown and Oguzhan Bayrak.