|
Title |
Cracking Behavior of Concrete Box Culvert for Power Transmission Due to Drying Shrinkage
|
|
DOI |
http://dx.doi.org/10.11112/jksmi.2016.20.1.001 |
|
Keywords |
박스형 전력구 ; 수분확산계수 ; 건조수축 ; 균열 ; 수치해석 Box culvert ; Diffusion coefficient ; Drying shrinkage ; Cracking ; Numerical analysis |
|
Abstract |
The purpose of this study is to predict the cracking behavior and suggest the method of controlling the cracking in concrete box culvert for power transmission due to differential drying shrinkage. Drying shrinkage cracking is mainly influenced by the moisture diffusion coefficient that determines moisture diffusion rate inside concrete structures. In addition to the diffusion coefficient, surface coefficient of concrete surface and relative humidity of ambient air simultaneously affect the moisture evaporation from concrete inside to external air outside. Within the framework of drying shrinkage cracking mechanism, it is necessary to perform the numerical analysis, which involves these three influencing factors to predict and control the shrinkage cracking of concrete. In this study, moisture diffusion and stress analysis cor responding to drying shrinkage on concrete box culvert are performed with consideration of diffusion coefficient, surface coefficient, and relative humidity of ambient air. From the numerical results, it is found that cracking behavior due to differential drying shrinkage of box culvert shows the different feature according to three influencing factors and the methodology of controlling of drying shrinkage cracks can be suggested from this study.
|