Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
권호 표지

Compression Behavior of Wood Stud in Light Framed Wall as Functions of Moisture, Stress and Temperature

  • Park, Joo-Saeng (Division of Wood Engineering, Department of Forest Products, Korea Forest Research Institute) ;
  • Lee, Jun-Jae (Department of Forest Products, College of Agriculture & Life Science, Seoul National University)
  • Received : 2006.04.13
  • Accepted : 2006.06.21
  • Published : 2006.09.25
Download PDF
⟨ Previous Next ⟩

Abstract

There has been considerable research in recent times in light-timber med structures in fires. These structures have included horizontal (floor-like) panels in bending and walls under eccentric and approximately concentric vertical loading. It has been shown that compression properties are the most dominant mechanical properties in affecting structural response of these structures in fire. Compression properties have been obtained by various means as functions of one variable only, temperature. It has always been expected that compression properties would be significantly affected by moisture and stress, as well. However, these variables have been largely ignored to simplify the complex problem of predicting the response of light-timber framed structures in fire. Full-scale experiments on both the panels and walls have demonstrated the high level of significance of moisture and stress for a limited range of conditions. Described in this paper is an overview of these conditions and experiments undertaken to obtain compression properties as a functions of moisture, stress and temperature. The experiments limited temperatures to $20{\sim}100^{\circ}C$. At higher temperatures moisture vaporizes and moisture and stress are less significant. Described also is a creep model for wood at high temperatures.

Keywords

References

  1. Konig J. and L. Walleij. 2000. Timber frame assemblies exposed to standard and parametric Fires. Part2: A design model for standard fire exposure. Tratek (Swedish Institute for Wood Technology Research), Stockholm, Report I 0001001
  2. White R. H., S. M. Cramer, and D. K. Shrestha 1993. Fire endurance model of a metal-plate connected wood truss. Research Paper FPL 522 ; US Department of Agriculture, Forest Products Laboratory, Madison, Wisconsin, USA
  3. Gehards C. C. 1984. Effect of moisture content and temperature on the mechanical properties of wood: An analysis of immediate effects. Wood and Fiber, pp 4-36
  4. Young S. A. and P. Clancy. 2001. Compression mechanical properties of wood at temperatures simulating fire conditions. Journal of Fire and Materials, Vol. 25 No. 3, pp 83-93 https://doi.org/10.1002/fam.759
  5. Thomas G. C. 1997. Fire resistance of light timber rramed walls and floors. Fire Engineering Research Report 97/7, School of Engineering, University of Canterbury, Christchurch, New Zealand
  6. Young S. A. and P. Clancy. 2001. Structural modeling of light-timber framed walls in fire. Fire Safety Journal, Vol. 36/3, pp 241-268 https://doi.org/10.1016/S0379-7112(00)00053-9
  7. International Standards Organization, 2000. Fire resistance tests elements of building construction : ISO 834
  8. Young S. A. 2001. Structural modeling of plasterboard-clad light timber framed walls in fire. Ph. D. Thesis, Center for Environmental Safety and Risk Engineering, Victoria University of Technology, Melbourne, Australia
  9. American Society for Testing and Materials. 1994. Standard methods of static tests of timbers in structural sizes: ASTM Designation: D198-84
  10. White R. H. and E. L. Schaffer. 1981. Transient moisture gradient in fire-exposed wood slab. Wood and Fiber, Vol. 13 part 1, pp 17-38
  11. Fredlund B. 1988. A model for heat and mass transfer in timber structures during fire: A theoretical, numerical and experimental study. Lund University, Sweden, Institute of Science and Technology, Department of Fire Engineering, Report LUTVDG/ (TVBB1003)
  12. Armstrong L. D. and G. N. Christensen. 1961. Influence of moisture changes on deformation of wood under stress. Nature, Vol. 191, pp 869-870 https://doi.org/10.1038/191869a0
  13. Armstrong L. D. and R. S. T. Kingston. 1962. The effect of moisture content changes on the deformation of wood under stress, Australian Journal of Applied Science, Vol. 13, pp 257-275
  14. Hearmon R. F. S. and J. M. Paton, 1964. Moisture content changes and creep of wood. Forest Products Journal, Vol. 14, No. 8, pp 357-359
  15. Schaffer E. L. 1973. Effect of pyrolytic temperatures on the longitudinal strength of dry Douglas-fir. ASTM Journal for Testing and Evaluation, Vol. 1, Part 4, pp 319-329 https://doi.org/10.1520/JTE10025J
  16. Buchanan A. H. 1986. Combined bending and axial load in lumber. Journal of Structural Engineering, ASCE, Vol. 112, No. 12, pp 2592-2609 https://doi.org/10.1061/(ASCE)0733-9445(1986)112:12(2592)