지하철 구조물의 온도균열제어를 위한 시공조건별 해석적 영향 분석

Parametric Analysis on Construction Conditions to Control Thermal Cracks in Subway Concrete Structure

  • 김연태 (서울산업대학교 구조공학과) ;
  • 김상철 (한서대학교 토목공학과)
  • 발행 : 2004.12.01

초록

The wall in a subway structure is easily subject to crack occurrence since its expansion and shrinkage associated with hydration heat reaction is constrained by the slab. The greater problem is that the crack in the wall may be developed to pass through thickness and eventually deteriorate the structure due to rusting of reinforced steel. Thus, this study aims at controlling thermal cracks as much as possible and determining an optimized size of concrete placement through hydration heat analysis. For this study, effects of placement height, length, temperature and types of cement on the thermal cracks were evaluated by temperature rise, thermal stress and crack index. As results of parametric study, it was found that placement height and length do not have an effect on the temperature rise but have significant one on thermal stress which relates to direct possibility of thermal crack occurrence. This means that proper selection of size balancing internal constraint with external one is much more important than reducing the placement height and length simply. In order to prevent from thermal cracks most effectively, in addition, it was noted to reduce placement temperature and to use the cement blended with mineral admixture.

키워드

참고문헌

  1. 콘크리트표준시방서 해설, 건설교통부, 2003
  2. 도시철도(지하철)공사 표준시방서, 건설교통부, 1997
  3. 서울특별시, '지하철 구조물의 내구성 확보를 위한 연구,' 1999
  4. 지하박스 콘크리트 구조물의 결함원인 및 대책, 건설교통부, 2001
  5. 강석화. '매수콘크리트의 온도균열제어를 위한 시공방법,' 콘크리트학회지, 제9권 3호, 1997, pp.4-14
  6. 김진근외 5인, '콘크리트 구조물의 균열,' 한국콘크리트학회, 제7회 기술강좌, 1997
  7. ACI, 'Causes, Evaluation and Repair of Cracks in Concrete Structures,' ACI Committee 224, 1984
  8. ACI, 'Control of Cracking in Concrete Structures,' ACI Committee 224, 1984
  9. Emmons, P.H., 'Concrete REpair and Maintenance Illustrated,' R.S. Mean Company, 1984
  10. Trout, J., 'Epoxy Injection in Construction,' The Aberdeen Group, 1993