Computers and Concrete

Techno-Press (테크노프레스)
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Numeric simulation of near-surface moisture migration and stress development in concrete exposed to fire

  • Consolazio, Gary R. (Department of Civil & Coastal Engineering, University of Florida) ;
  • Chung, Jae H. (Department of Civil & Coastal Engineering, University of Florida)
  • Received : 2003.05.06
  • Accepted : 2003.09.15
  • Published : 2004.02.25
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Abstract

A methodology is presented for computing stresses in structural concrete members exposed to fire. Coupled heat and moisture migration simulations are used to establish temperature, pore pressure, and liquid-saturation state variables within near-surface zones of heated concrete members. Particular attention is placed on the use of coupled heat and multiphase fluid flow simulations to study phenomena such as moisture-clogging. Once the state variables are determined, a procedure for combining the effects of thermal dilation, mechanical loads, pore pressure, and boundary conditions is proposed and demonstrated. Combined stresses are computed for varying displacement boundary conditions using data obtained from coupled heat and moisture flow simulations. These stresses are then compared to stresses computed from thermal analyses in which moisture effects are omitted. The results demonstrate that moisture migration has a significant influence on the development of thermal stresses.

Keywords

Acknowledgement

Supported by : National Science Foundation

References

  1. ADINA (2002), ADINA Research and Development Inc. ADINA Theory and Modeling Guide. Report ARD 02-7, Watertown, MA.
  2. ASTM (1995), ASTM E 119-95a, "Standard test methods for fire tests of building construction and materials", Annual Book of ASTM Standards, 1995, American Society for Testing and Materials (ASTM), West Conshohocken, PA, 441-461.
  3. Bamforth, P.B. (1987), "The relationship between permeability coefficients for concrete obtained using liquid and gas", Mag. Concr. Res., 30(138), 233-241.
  4. Baroghel-Bouny, V. and Chaussadent, T. (1996), "Texture and moisture characterization of hardened cement pastes and concrete from water vapor sorption measurements", The Modeling of Microstructure and Its Potential for Studying Transport Properties and Durability, Nato ASI Series (304), Kluwer Academic Publishers, Boston, MA, 241-255.
  5. Z.P. and Kaplan, M.F. (1996), Concrete at High Temperatures : Material properties and mathematical modeling, Longman Group Limited, Essex, England.
  6. Burg, R.G. and Ost, B.W (1994), Engineering Properties of Commercially Available High Strength Concretes, PCA Research and Development Bulletin RD104T, Skokie, IL.
  7. Chung, J.H. (2003), "Numerical simulation of hygro-thermo-mechanical behavior of concrete structures exposed to elevated temperatures", Doctoral Dissertation, Department of Civil & Coastal Engineering, University of Florida.
  8. Chung, J.H. and Consolazio, G.R. (2003), "Moisture movement and heat flow in reinforced concrete columns subjected to fire", Proceedings of the Second MIT Conference on Computational Fluid and Solid Mechanics, Boston, MA, 2, 1287-1292.
  9. Consolazio, G.R., McVay, M.C. and Rish, J.W. III (1998), "Measurement and prediction of pore pressures in saturated cement mortar subjected to radiant heating", ACI Mater. J., 95(5), 525-536.
  10. Consolazio, G.R. and Chung, J.H. (1998), "Numerical prediction of pore pressure in concrete structures subjected to rapid heating", Proceedings of the Fifth International Conference on Composites in Engineering: ICCE/5, Las Vegas, NV, USA, July.
  11. Dhir, R.K., Hewlett, P.C. and Chan, Y.N. (1989), "Near surface characteristics of concrete: Intrinsic permeability", Mag. Concr. Res., 41(147), 87-97. https://doi.org/10.1680/macr.1989.41.147.87
  12. Gawin, D., Majorana, C.E. and Schrefler, B.A. (1999), "Numerical analysis of hygro-thermal behavior and damage of concrete at high temperature", Mech. Cohes.-Frict. Mater., 4, 37-74. https://doi.org/10.1002/(SICI)1099-1484(199901)4:1<37::AID-CFM58>3.0.CO;2-S
  13. Harmathy, T.Z. (1964), "Effect of moisture on the fire endurance of building elements", Moisture in Materials in Relation to Fire Tests, ASTM Publication STP 385, American Society of Testing and Materials, 74-95.
  14. Hsu, T. (1986), The Finite Element Method in Thermomechanics, Allen & Unwin, Inc., London, UK.
  15. Jacobs, F. (1998), "Permeability to gas of partially saturated concrete", Mag. Concr. Res., 50(2), 115-121. https://doi.org/10.1680/macr.1998.50.2.115
  16. Klinkenberg, L.J. (1941), "The permeability of porous media to liquids and gases", API Drilling and Production Practice, American Petroleum Institute, 200-207.
  17. Kodur, V.K.R. and Lie, T.T. (1997), "Evaluation of fire resistance of rectangular steel columns filled with fibrereinforced concrete", Can. J. Civ. Eng., 25, 339-349.
  18. Kodur, V.K.R. (1998), "Performance of high strength concrete-filled steel columns exposed to fire", Can. J. Civ. Eng., 25, 975-981. https://doi.org/10.1139/l98-023
  19. Lewis, R.W. and Schrefler, B.A. (1998), The Finite Element Method in the Static and Dynamic Deformation and Consolidation of Porous Media, John Wiley & Sons, Inc., New York.
  20. McVay, M.C. and Rish, J.W. III (1995), "Flow of nitrogen and superheated steam through cement mortar", J. ThermoPhysics Heat Transfer, 9(4), 790-792. https://doi.org/10.2514/3.740
  21. Nechnech, W., Meftah, F. and Reynouard, J.M. (2002), "An elasto-plastic model for plain concrete subjected to high temperatures", Eng. Structures., 24, 597-611. https://doi.org/10.1016/S0141-0296(01)00125-0
  22. Phan, L.T., Lawson, J.R. and Davis, F.L. (2001), "Effects of elevated temperature exposure on heating characteristics, spalling, and residual properties of high performance concrete", Materials and Structures, 34, 83-91. https://doi.org/10.1007/BF02481556
  23. Pruess, K. (1991), TOUGH2 : A General-Purpose Numerical Simulator for Multiphase Fluid and Heat Flow, Earth Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720, Document LBL-29400.
  24. Whiting, D. (1988), "Permeability of selected concrete", Permeability of Concrete, ACI Publication SP-108, American Concrete Institute, 195-222.

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  2. An anisotropic thermomechanical damage model for concrete at transient elevated temperatures vol.363, pp.1836, 2005, https://doi.org/10.1098/rsta.2005.1589