Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
권호 표지
DOI QR코드

DOI QR Code

Stiffness Modification Factor for Reinforced Concrete Flat Plates with Steps

단차가 있는 철근콘크리트 무량판의 강성보정계수에 대한 연구

  • Received : 2013.07.30
  • Accepted : 2014.02.26
  • Published : 2014.03.25
⟨ Previous Next ⟩

Abstract

The purpose of this study is to propose a modification factor to reflect the stiffness modification when a step is located in flat plates. Reinforced concrete slabs with steps have different structural characteristics that are demonstrated by a series of structural experiment and nonlinear analysis. The corner at the step is weak and flexible, and thus the associated rotational stiffness at the corner of the step is identified through analysis of 6 type models using a nonlinear finite element program. Then a systematic analysis on stiffness changes is performed using a linear finite element procedure along with rotational springs. The stiffness of reinforced concrete flat plates with steps is mainly affected by the step length, location, thickness and height. Therefore, a single modification factor for each of these variables is obtained, while other variables are constrained. When multiple variables are considered, each single modification factor is multiplied each other. Such a method is verified by a comparative analysis. Finally, a complex modification factor can be applied to the existing effective beam width.

Keywords

Acknowledgement

Supported by : 한국연구재단

References

  1. 한국토지주택공사 기전설계처, "화장실 생활소음 저감을 위한 당해층 배관공법 설계 기준수립(안)", 한국토지주택공사, 2011.
  2. 김상희, 강현구, 홍건호, 한규범, 박홍근, "단차가 있는 철근콘크리트 슬래브의 구조성능 평가 실험 및 상세 제안", 한국콘크리트학회 논문집, 제 25권, 제 4호, 2013, p.p.447-455.
  3. 김상희, 강현구, 홍건호, 한규범, 송정훈, 박홍근, "슬래브 단차가 있는 무량판 구조의 실험적 연구", 한국콘크리트학회, 2012년도 가을 학술대회 논문집, Vol.24, No.2, 2012, p.p.61-62.
  4. 김상희, 강현구, 홍건호, 한규범, 송정훈, 박홍근, "슬래브 단차가 있는 무량판 구조의 실험적 연구 II", 한국콘크리트학회 2013년도 봄 학술대회 논문집, Vol. 25, No. 1, 2013, p.p.381-382.
  5. 김영민, "비선형 탄성연결요소를 이용한 해석", MIDASIT, MIDAS 노트, 2010
  6. 대한건축학회, 건축구조기준 및 해설, 기문당, 2009
  7. 한국토지주택공사 구조견적단, 건축구조설계지침, 한국토지주택공사, 2010.
  8. Macgregor, J. G., and Wight, J. K., Reinforced Concrete Mechanics and Design, Prentice Hall, Singapore, 2005
  9. 한국콘크리트학회, 콘크리트구조기준, 기문당, 2012
  10. Grossman J. S., "Verification of Proposed Design Methodologies for Effective Width of Slabs in Slab-Column Frames", ACI Structural Journal, V. 94, No. 2, March-April, 1997, p.p.181-196.