Wind and Structures

  • 제4권3호
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  • Pages.213-226
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  • 2001
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Application of numerical models to determine wind uplift ratings of roofs

  • Baskaran, A. (National Research Council Canada) ;
  • Borujerdi, J. (Department of Civil Engineering, University of Ottawa)
  • 발행 : 2001.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

Wind uplift rating of roofing systems is based on standardised test methods. Roof specimens are placed in an apparatus with specified table size (length and width) then subjected to the required wind load cycle. Currently, there is no consensus on the table size to be used by these testing protocols in spite of the fact that a table size plays a significant role in evaluating the performance. This paper presents a study with the objective to investigate the impact of table size on the performance of roofing systems. To achieve this purpose, extensive numerical experiments using the finite element method have been conducted to investigate the performance of roofing systems subjected to wind uplift pressures. Numerical results were compared with results obtained from experimental work to benchmark the numerical modeling. Required table size and curves for the determinations of appropriate correction factors are suggested. This has been completed for various test configurations with thermoplastic waterproofing membranes. Development of correction factors for assemblies with thermoset and modified bituminous membranes are in progress. Generalization of the correction factors and its usage for wind uplift rating of roofs will be the focus of a future paper.

키워드

참고문헌

  1. ABAQUS User's Manual, version 5.8, 1998. Hibbitt, Karlsson and Sorensen, Inc., Pawtucket, RI.
  2. American Society for Testing and Materials (1998), "Standard test methods for coated fabrics, D 751-98", ASTM, Philadelphia, USA.
  3. Baskaran, A., Zahrai, S.M. and Chen, Y. (1999), "Numerical evaluation of roofing systems for wind uplift pressures", Proc, of the tenth ICWE, Copenhagen, Denmark, June, 3, 1747-1754.
  4. Baskaran, A., Lei, W. and Richardson C. (1999), "Dynamic evaluation of thermoplastic roofing systems for wind performance," J. Arch. Eng., ASCE, 5(5), 16-24. https://doi.org/10.1061/(ASCE)1076-0431(1999)5:1(16)
  5. Baskaran, A. and Lei, W. (1997), "A new facility for dynamic wind performance evaluation of roofing systems", Proc. of the Fourth Int. Symp. on Roofing Technology, NRCA/NIST, Washington, D.C., U.S.A., 168-179.
  6. Baskaran, A. and Kashef, A. (1995), "Application of numerical models for the dynamic evaluation of roofing systems, Part 1: Review of the state-of-the-art ", Internal report No. 690, National Research Council Canada, Ottawa, Ontario, Canada.
  7. Bienkiewicz, B. and Sun Y. (1993), "Numerical and experimental studies of wind loading on loose-laid roofing systems", Colorado State University, Civil Engineering Department, Fort Collins, Colorado, USA.
  8. Cook, N.J., Keevil, A.P. and Stobart, R.K. (1988), "BRERWULF - The Big Bad Wolf ", J. Wind Eng. Ind. Aerod., 29, 99-107. https://doi.org/10.1016/0167-6105(88)90149-3
  9. Easter, M.R. (1990), "Finite element analysis of roofing systems", Roofing Research and Standards Development: American Society for Testing and Materials, Philadelphia, 2, STP 1088, 138-151.
  10. Factory Mutual Research, (1986). Approval Standard: Class I Roof Covers (4470), Norwood, Massachusetts, USA.
  11. Factory Mutual Research, (1992). Approval Standard: Class I Roof Covers (4470), Norwood, Massachusetts, USA.
  12. Gerhardt, H.J. and Kramer, C. (1986), "Wind induced loading cycle and fatigue testing of lightweight roofing fixations", J. Wind Eng. Ind. Aerod., 23, 237-247. https://doi.org/10.1016/0167-6105(86)90045-0
  13. Gerhardt, H.J. and Gerbatsch, R.W. (1989), "Wind loads on single-ply membranes", The Construction Specifier, November, 60-71.
  14. Lewis, J.E. (1980), "Preliminary stress evaluation of the effects of gaps between roof insulation panels", J. Thermal Insulation, 4, 3-36. https://doi.org/10.1177/109719638000400101
  15. Paulsen, E.M., (1989), "NBI roof wind uplift strength test facility and load programs", Proc. of the Roof Wind Uplift Testing Workshop, Oak Ridge, Tennessee, 46-51.
  16. Rossiter, W.J., Jr. and Batts, M.E. (1985), "Finite-element analysis of temperature induced stresses in single-ply roofing membranes", Durability of Build. Mater., 2, 195-208.
  17. Underwriters Laboratories Inc. (1991), "Standard for wind uplift pressure of roof assemblies (UL 580)", Third edition, Nov.
  18. Zahrai S. M. and Baskaran, A. (1999), "Numerical evaluation for the effect of table size on roof wind uplift resistance, Part 1: Thermoplastic roofing system", Internal report No. (IRC-IR 709), National Research Council Canada, Ottawa, Ontario, Canada.
  19. Zarghamee, M. S. (1990), "Wind effects on single-ply roofing systems", J. Struct. Eng., 116(1), January, 177-187, Paper No. 24277. https://doi.org/10.1061/(ASCE)0733-9445(1990)116:1(177)

피인용 문헌

  1. Application of numerical models to evaluate wind uplift ratings of roofs: Part II vol.8, pp.3, 2005, https://doi.org/10.12989/was.2005.8.3.213
  2. Calculating roof membrane deformation under simulated moderate wind uplift pressures vol.31, pp.3, 2009, https://doi.org/10.1016/j.engstruct.2008.10.013
  3. A novel approach to estimate the wind uplift resistance of roofing systems vol.44, pp.4, 2009, https://doi.org/10.1016/j.buildenv.2008.06.024