파이프쿨링을 실시한 대형 프리스트레스트 콘크리트 슬래브의 수화열 해석

Numerical analysis of temperature and stress distributions in a prestressed concrete slab with pipe cooling

  • 주영춘 (서울산업대학교 토목공하과) ;
  • 김은겸 (서울산업대학교 토목공학과) ;
  • 신치범 (아주대학교 화학공학과) ;
  • 조규영 (동아건설산업 (주) 부장 (인천출장소)) ;
  • 박용남 (인천국제공항공사)
  • 발행 : 1999.04.01

초록

It was analysed the effect of pipe cooling as a measure to avoid thermal cracks due to the heat of hydration during the curing process of a massive prestressed concrete (PSC) slab. PSC slab has a complex three-dimensional shape of which the maximal and minimal thicknesses of cross-section were 2.8 and 0.95m, respectively. Steel pipes of which the diameter was 1 inch were employed for cooling. The horizontal and vertical distances between the contiguous pipes were 0.5 and 0.6m, respectively. One the four layers of cooling pipe were arranged according to the thickness of cross-section. Temperature distribution was calculated by the program developed by the authors, of which the accuracy was verified on a few published papers by the authors. Based on the temperature analysis of the cross-section which had four layers of cooing pipe, the maximum temperature of concrete interior was 54.2$^{\circ}C$ and the maximum differenced between the interior and surface temperatures of concrete was 14.$0^{\circ}C$ and, thereby, the thermal cracking index was 1.1. Upon the stress analysis, the thermal cracking index was 0.92 and the probability of thermal-crack development was 52%. Therefore, it was expected to make it possible to reduce the probability of thermal-crack development in a massive PSC slab by adopting pipe cooling.

키워드