Wind and Structures

Techno-Press (테크노프레스)
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Effects of wind direction on the flight trajectories of roof sheathing panels under high winds

  • Kordi, Bahareh (Boundary Layer Wind Tunnel Laboratory, Faculty of Engineering, University of Western Ontario) ;
  • Traczuk, Gabriel (Boundary Layer Wind Tunnel Laboratory, Faculty of Engineering, University of Western Ontario) ;
  • Kopp, Gregory A. (Boundary Layer Wind Tunnel Laboratory, Faculty of Engineering, University of Western Ontario)
  • Received : 2009.09.25
  • Accepted : 2009.12.15
  • Published : 2010.03.25
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Abstract

By using the 'failure' model approach, the effects of wind direction on the flight of sheathing panels from the roof of a model house in extreme winds was investigated. A complex relationship between the initial conditions, failure velocities, flight trajectories and speeds was observed. It was found that the local flow field above the roof and in the wake of the house have important effects on the flight of the panels. For example, when the initial panel location is oblique to the wind direction and in the region of separated flow near the roof edge, the panels do not fly from the roof since the resultant aerodynamic forces are small, even though the pressure coefficients at failure are high. For panels that do fly, wake effects from the building are a source of significant variation of flight trajectories and speeds. It was observed that the horizontal velocities of the panels span a range of about 20% - 95% of the roof height gust speed at failure. Numerical calculations assuming uniform, smooth flow appear to be useful for determining panel speeds; in particular, using the mean roof height, 3 sec gust speed provides a useful upper bound for determining panel speeds for the configuration examined. However, there are significant challenges for estimating trajectories using this method.

Keywords

References

  1. Applied Research Associates, Inc. (2002), HAZUS, Wind Loss Estimation Methodology, Volume I. North Carolina, October 2002.
  2. ASCE 7-05 (2005), Minimum Design Loads for Buildings and Other Structures, American Society of Civil Engineers, Reston, Virginia.
  3. Baker, C.J. (2007), "The debris flight equations", J. Wind Eng. Ind. Aerod., 95, 329-353. https://doi.org/10.1016/j.jweia.2006.08.001
  4. Engineering Sciences Data Unit (1974), Characteristics of atmospheric turbulence near the ground, Data Item 74031.
  5. Engineering Sciences Data Unit (1982), Strong winds in the atmosphere boundary layer. Part 1: Mean-hourly wind speeds, Data Item 82026.
  6. Engineering Sciences Data Unit (1983), Strong winds in the atmosphere boundary layer. Part 2: Discrete gust speeds, Data Item 83045.
  7. Holmes, J.D. (2004), "Trajectories of spheres in strong winds with application to wind-borne debris", J. Wind Eng. Ind. Aerod., 92, 9-22.
  8. Holmes, J.D., Letchford, C.W. and Lin, N. (2006), "Investigations of plate-type windborne debris- Part II :Computed trajectories", J. Wind Eng. Ind. Aerod., 94, 21-39. https://doi.org/10.1016/j.jweia.2005.10.002
  9. Iversen, J.D. (1979), "Autorotating flat plate wings: the effect of the moment of inertia, geometry and Reynolds number", J. Fluid Mech., 92, 327-348. https://doi.org/10.1017/S0022112079000641
  10. Kopp, G.A., Surry, D. and Mans, C. (2005), "Wind effects of parapets on low buildings: Part 1. Basic aerodynamics and local loads", J. Wind Eng. Ind. Aerod., 93, 817-841. https://doi.org/10.1016/j.jweia.2005.08.006
  11. Kopp, G.A., Oh, J.H. and Inculet, D.R. (2008a), "Wind-induced internal pressures in houses", J. Struct. Eng. ASCE, 134, 1129-1138. https://doi.org/10.1061/(ASCE)0733-9445(2008)134:7(1129)
  12. Kopp, G.A., Morrison, M.J., Iizumi, E., Henderson, D. and Hong, H.P. (2008b), "The 'Three Little Pigs' Project: Hurricane Risk Mitigation by Integrated Wind Tunnel and Full-Scale Laboratory Tests", Nat. Hazards Review, ASCE, (submitted).
  13. Kordi, B. and Kopp, G.A. (2009a), "Discussion of the debris flight equations", J. Wind Eng. Ind. Aerod., 97, 151-154. https://doi.org/10.1016/j.jweia.2008.10.001
  14. Kordi, B. and Kopp, G.A. (2009b), "Evaluation of the quasi-steady theory applied to windborne flat plates in uniform flow", J. Eng. Mech. ASCE, 135(7), 657-668. https://doi.org/10.1061/(ASCE)EM.1943-7889.0000008
  15. Kordi, B. and Kopp, G.A. (2010), "Effects of Initial Conditions on the Flight of Windborne Plate Debris", J. Wind Eng. Ind. Aerod., (submitted).
  16. Lin, N., Letchford, C. and Holmes, J.D. (2006), "Investigation of plate-type windborne debris. Part I. Experiments in wind tunnel and full scale", J. Wind Eng. Ind. Aerod., 94, 51-76. https://doi.org/10.1016/j.jweia.2005.12.005
  17. Lin, N., Holmes, J.D. and Letchford, C. (2007), "Trajectories of Wind-Borne Debris in Horizontal Winds and Applications to Impact Testing", J. Struct. Eng. ASCE, 133, 274-282. https://doi.org/10.1061/(ASCE)0733-9445(2007)133:2(274)
  18. Richards, P.J., Williams, N., Laing, B., McCarty, M. and Pond, M. (2008), "Numerical calculation of the threedimensional motion of wind-borne debris", J. Wind Eng. Ind. Aerod., 96, 2188-2202. https://doi.org/10.1016/j.jweia.2008.02.060
  19. St. Pierre, L.M., Kopp, G.A., Surry, D. and Ho, T.C.E. (2005), "The UWO contribution to the NIST aerodynamic database for wind loads on low buildings: Part 2. Comparison of data with wind load provisions", J. Wind Eng. Ind. Aerod., 93, 31-59. https://doi.org/10.1016/j.jweia.2004.07.007
  20. Surry, D. (1982), Consequences of distortions in the flow including mismatching scales and intensities of turbulence, Wind Tunnel modelling for civil engineering applications, (ED: T.A. Reinhold), Cambridge University Press, Cambridge, 1982, 137-185.
  21. Surry, D., Kopp, G.A. and Bartlett, F.M. (2005), "Wind load testing of low buildings to failure at model and full scale", Nat. Hazards Review, ASCE, 6, 121-128. https://doi.org/10.1061/(ASCE)1527-6988(2005)6:3(121)
  22. Tachikawa, M. (1983), "Trajectories of flat plates in uniform flow with application to wind-generated missiles", J. Wind Eng. Ind. Aerod., 14, 443-453. https://doi.org/10.1016/0167-6105(83)90045-4
  23. Tachikawa, M. (1988), "A method for estimating the distribution range of trajectories of wind-borne missiles", J. Wind Eng. Ind. Aerod., 29, 175-184. https://doi.org/10.1016/0167-6105(88)90156-0
  24. Visscher, B.T. and Kopp, G.A. (2007), "Trajectories of roof sheathing panels under high winds", J. Wind Eng. Ind. Aerod., 95, 697-713. https://doi.org/10.1016/j.jweia.2007.01.003
  25. Wills, J.A.B., Lee, B.E. and Wyatt, T.A. (2002), "A model of wind-borne debris damage", J. Wind Eng. Ind. Aerod., 90, 555-565. https://doi.org/10.1016/S0167-6105(01)00197-0

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