철근에 의한 구속 효과를 고려한 고층건물 콘크리트 슬래브의 건조수축응력 해석 = Shrinkage Stress Analysis of Concrete Slab in Multistory Building Considering Internal Restraint of Reinforcement Bar

다국어 초록 (Multilingual Abstract)

Shrinkage strains of concrete slab in multi-story building are restrained internally by reinforcement bar as well as externally by supporting members such as columns or walls. These strains can induce tensile stresses in concrete members and lead to cracks due to excessive shrinkage stress. In this study, a practical method of shrinkage stress analysis on concrete slab in multi-story building is proposed, which considers both internal restraint and external restraint variation resulting from construction sequence. The shrinkage stress due to external restraint is obtained by multiplying relaxation coefficient to elastic shrinkage stress. The additional shrinkage stress due to internal restraint is obtained by residual strain of the elastic analysis. A verification example was analyzed and compared by the proposed method and commercial analysis program that is capable of time-dependent analysis of concrete. The results of 10-story example building show that the internal restraint of reinforcement increases the shrinkage stress considerably at the slabs under loose external restraint.

참고문헌 (Reference)

1 "구속조건 변화와 크리프에 의한 응력 완화를 고려한 고층건물 큰크리트 슬래브의 건조수축 응력해석" 19 (19): 29-36, 2003

2 "건설교통부제정 콘크리트 구조설계 기준" 기문당 41-50, 1999

3 "and Brooks J.J." Construction Press 1983

4 "Time Effects in Concrete Structures Elsevier" 1988

5 "Shrinkage Stress Analysis of Concrete Slabs with Shrinkage Strips in a Multistory Building" 82 (82): 1143-1152, 2004

6 "Shrinkage Cracking of Restrained Concrete Slab" 124. (124.): 765-774, 1998

7 "Shrinkage Cracking in Fully Restrained Concrete Members" 89 (89): 141-149, 1992

8 "Shrinkage Cracking and Crack Control in Restrained Reinforced Concrete Members" 101 (101): 840-845, 2004

9 "Prediction of Creep, Shrinkage, and Temperature Effects in Concrete Structure" -92, 1997.

10 "Prediction of Concrete Effects Using Age-Adjusted Effective Modulus Method" 69 : 212-217, 1972

11 "Numerical Determinatin of Long-Range Stress History from Strain History in Concrete" 5 : 135-141, 1972

12 "Model of studying shrinkage cracking in concrete building walls" 85 : 395-404, 1988

13 "Midas/Gen-General Structure Design System for Windows" 2005

14 "Handbook of Concrete Engineering" 121-138,

15 "Finite Element Procedures in Engineering Analysis" Prentice-Hall 294-297, 1982

16 "Creep and Shrinkage in Concrete Structures John Wiley & Sons" 1982