Trajectories of roof sheathing panels under high winds

Abstract A 1:20 scale, aeroelastic “failure” model of a house was used to evaluate the flight mechanics of a scaled 1.2 m×2.4 m (4 ft×8 ft) roof sheathing panel in a scaled, open country, turbulent boundary layer. The panel was held to the model house with electromagnets which applied scaled restraining forces. The initial failure mechanism and the trajectory of the panel in flight were captured with high-speed digital video. For nominally similar initial conditions, different modes of flight were observed including purely translational and auto-rotational modes. These two modes lead to distinctly different lengths of flight and to different flight speeds, with the auto-rotational mode yielding higher speeds over greater distances.

[1]  M. Tachikawa.  A method for estimating the distribution range of trajectories of wind-borne missiles , 1988 .

[2]  H. Tieleman.  Wind tunnel simulation of wind loading on low-rise structures: a review , 2003 .

[3]  M. Tachikawa.  Trajectories of flat plates in uniform flow with application to wind-generated missiles , 1983 .

[4]  J. D. Holmes,et al.  The effects of scale distortion on total wind loads on a low rise building model , 1988 .

[5]  Fran Hunia,et al.  Three Little Pigs , 1940 .

[6]  David Surry,et al.  WIND LOAD TESTING OF LOW BUILDINGS TO FAILURE AT MODEL AND FULL-SCALE , 2005 .

[7]  Ning Lin,et al.  Investigation of plate-type windborne debris. Part I. Experiments in wind tunnel and full scale , 2006 .

[8]  David Surry,et al.  Structurally Effective Static Wind Loads for Roof Panels , 2007 .

[9]  J. E. Minor,et al.  Windborne debris and the building envelope , 1994 .

[10]  Ning Lin,et al.  Investigations of plate-type windborne debris—Part II: Computed trajectories , 2006 .

[11]  J. D. Holmes,et al.  Trajectories of spheres in strong winds with application to wind-borne debris , 2004 .

[12]  Yukio Tamura,et al.  Tachikawa number: A proposal , 2006 .

[13]  T. A. Wyatt,et al.  A model of wind-borne debris damage , 2002 .

[14]  J. D. Holmes,et al.  Wind Loading of Structures , 2001 .

[15]  Christopher Baker.  The debris flight equations , 2007 .

[16]  David Surry,et al.  Wind effects of parapets on low buildings: Part 1. Basic aerodynamics and local loads , 2005 .

[17]  David Surry,et al.  Wind Tunnel and Uniform Pressure Tests of a Standing Seam Metal Roof Model , 2005 .