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Computers and Concrete Volume 1, Number 1, February 2004 , pages 31-46 DOI: https://doi.org/10.12989/cac.2004.1.1.031 |
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Numeric simulation of near-surface moisture migration and stress development in concrete exposed to fire |
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Gary R. Consolazio and Jae H. Chung
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| Abstract | ||
| A methodology is presented for computing stresses in structural concrete members exposedrnto fire. Coupled heat and moisture migration simulations are used to establish temperature, pore pressure,rnand liquid-saturation state variables within near-surface zones of heated concrete members. Particularrnattention is placed on the use of coupled heat and multiphase fluid flow simulations to study phenomenarnsuch as moisture-clogging. Once the state variables are determined, a procedure for combining the effectsrnof thermal dilation, mechanical loads, pore pressure, and boundary conditions is proposed and demonstrated.rnCombined stresses are computed for varying displacement boundary conditions using data obtained fromrncoupled heat and moisture flow simulations. These stresses are then compared to stresses computed fromrnthermal analyses in which moisture effects are omitted. The results demonstrate that moisture migrationrnhas a significant influence on the development of thermal stresses.rn | ||
| Key Words | ||
| fire; pore pressure; slip-flow; relative permeability; thermal stress; effective stress. | ||
| Address | ||
| University of Florida, Department of Civil & Coastal Engineering, P.O. Box 116580, Gainesville, FL 32611, U.S.A. | ||