Moving Mesh Technique을 이용한 2차원 염해 침투 예측 모델의 개발
Development of Two Dimensional Chloride Ion Penetration Model Using Moving Mesh Technique
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Most of chloride diffusion models based on finite difference method (FDM) could not express the diffusion in horizontal direction at each elevation. Toovercome these weakness, two dimensional chloride ion penetration model based on finite element method (FEM) to be able to combine variousmulti-physics simultaneously was suggested by introducing moving mesh technique. To avoid the generation of mesh being able to be distorted dependingon the relative movement of water level to static concrete, a rectangular type of mesh was intentionally adopted and the total number of meshes wasempirically selected. The simulated results showed that the contents of surface chloride decreased following to the increase of elevation in the top part oflow sea level, whereas there were no changes in the bottom part of low level. In the DuraCrete model, the diffusion coefficient of splashed zone is generallysmaller than submerged zone, whereas the trend of Life365 model is reverse. Therefore, it could be understood that the developed model using movingmesh technique effectively reflects DuraCreteTMmodel rather than Life365TMmodel. In the future, the model will be easily expanded to be combined withvarious multi-physics models considering water evaporation, heat of hydration, irradiation effect of sun and so on because it is based on FEM.
Abstract
Most of chloride diffusion models based on finite difference method (FDM) could not express the diffusion in horizontal direction at each elevation. Toovercome these weakness, two dimensional chloride ion penetration model based on finite element method (FEM) to be able to combine variousmulti-physics simultaneously was suggested by introducing moving mesh technique. To avoid the generation of mesh being able to be distorted dependingon the relative movement of water level to static concrete, a rectangular type of mesh was intentionally adopted and the total number of meshes wasempirically selected. The simulated results showed that the contents of surface chloride decreased following to the increase of elevation in the top part oflow sea level, whereas there were no changes in the bottom part of low level. In the DuraCrete model, the diffusion coefficient of splashed zone is generallysmaller than submerged zone, whereas the trend of Life365 model is reverse. Therefore, it could be understood that the developed model using movingmesh technique effectively reflects DuraCreteTMmodel rather than Life365TMmodel. In the future, the model will be easily expanded to be combined withvarious multi-physics models considering water evaporation, heat of hydration, irradiation effect of sun and so on because it is based on FEM.
참고문헌 (24)
- Ann, K. Y., "The importance of chloride content at the concrete surface in assessing the time to corrosion of steel in concrete structures", Construction and Building Materials, 23(1), pp.239~245 (2009)
- Arora, P., "Corrosion initiation time of steel reinforcement in a chloride environment – a one dimensional solution", Corrosion Science, 39(4), pp.739~759 (1997)
- Bentz, E. C., "Manual of Life-365", Computer Program for Predicting the Service Life and Life-Cycle Costs of Reinforced Concrete Exposed to Chlorides, ~ (2001)
- 최원, "유한요소법을 이용한 3차원 염해 침투 예측 모델의 개발", 한국농공학회논문집, 57(5), pp.43~49 (2015), 한국농공학회
- Edvardsen, C. K., "Busan-Geoje fixed link concrete durability design for the bridges and tunnels", Tunnelling and Underground Space Technology, 21(3-4), pp.432~ (2006)
- 구임식, "GK 프로젝트에 적용되는 고내구성 해양콘크리트 배합설계에 관한 연구", 석사, 건설공학, pp.2008
- 송하원, "해안환경하에 있는 콘크리트 구조물의 시간의존적 염화물 침투 평가", 콘크리트학회 논문집, 19(5), pp.585~593 (2007), 한국콘크리트학회
- Japan Society of Civil Engineers, "Standard specification for durability of concrete", Concr Libr, 108 (2002)
- Ji, Y., "Chloride Ion Ingress in Concrete Exposed to a Cyclic Wetting and Drying Environment", Transactions of the ASABE, 52(1), pp.239~245 (2009)
- Kassir, M. K., "Chloride-induced corrosion of reinforced concrete bridge decks", Cement and Concrete Research, 32(1), pp.139~143 (2002)
- Kim, K. H., "Target Diffusion Coefficient of Marine Concrete Using DuraCrete Method", Korean Society of Civil Engineers, 2009(10), pp.1335~1338 (2009)
- Leandro, J., "Comparison of 1D", 1D and 1D, surface)hydraulic models for urban flood simulation, pp.Journal of hydraulic engineering, 2009[DOI]
- Liska, R., "Comparison of several difference schemes on 1D and 2D test problems for the Euler equations", SIAM Journal on Scientific Computing, 25(3), pp.995~1017 (2003)
- Marchand, J., "Predicting the service-life of concrete structures – Limitations of simplified models", Cement and Concrete Composites, 31(8), pp.515~521 (2009)
- Meira, G. R., "Durability of concrete structures in marine atmosphere zones – the use of chloride deposition rate on the wet candle as an environmental indicator", Cement and Concrete Composites, 32, pp.427~435 (2010)
- Ministry of Construction and Transportation, "Standard specification for concrete structures on durability" (2004), Kimundang
- Pack, S.-W., "Prediction of time dependent chloride transport in concrete structures exposed to a marine environment", Cement and Concrete Research, 40(2), pp.302~312 (2010)
- Song, H.-W., "Factors influencing chloride transport in concrete structures exposed to marine environments", Cement and Concrete Composites, 30(2), pp.113~121 (2008)
- Song, H.-W., "Service life prediction of repaired concrete structures under chloride environment using finite difference method", Cement and Concrete Composites, 31(2), pp.120~127 (2009)
- Takewaka, K., "Quality and cover thickness of concrete based on the estimation of chloride penetration in marine environments", Concrete in Marine Environment, SP-I09, Am. Concrete Inst, pp.381~400 (1988)
- Tang, L., "Rapid determination of the chloride diffusivity in concrete by applying an electrical field", ACI Mater. J, 89, pp.49~53 (1992)
- Val, D. V., "Life-cycle cost analysis of reinforced concrete structures in marine environments", Structural Safety, 25(4), pp.343~362 (2003)
- Service Life Estimates (SHRP-S-668). Strategic Highway Research Program, "Weyers, R. E.", National Research Council, ~ (1993)
- Zhang, J. Z., "Modelling of chloride diffusion into surface-treated concrete", Cement and Concrete Composites, 20(4), pp.253~261 (1998)