Codification of Wind‐Pressure Coefficients for Multispan Gable Roofs
Publication: Journal of Structural Engineering
Volume 120, Issue 8
Abstract
A wind‐tunnel study has been carried out to assess wind loads on multispan gable roofs with roof slopes of 4:12 and 12:12. Local and area‐averaged pressure coefficients were measured on models with one, two, and four spans. Critical suctions were significantly larger than those specified for single‐span roofs in wind standards. Discrepancies between single‐span design pressures and the multispan results were largest for the high‐pitch roof, for which local suctions obtained in the present study exceed the wind‐standard values by a factor of two. Suctions measured on the 4:12 single‐span and multispan roofs were 20–50% higher than design values specified in wind standards for single‐span buildings. Critical values of positive pressures measured on the 4:12 and 12:12 multispan gable roofs agree well with design pressures specified in wind standards for single‐span gable roofs. The largest positive pressures occurred on the high‐pitch roof along the low edge of the windward span and in the trough regions. The present paper proposes design pressure coefficients for multispan gable roofs.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
ASCE Task Committee on Wind Forces. (1961). “Wind forces on structures—Final Report.” ASCE Trans., 126(2), 1124–1198.
2.
Bienkiewicz, B., and Sun, Y. (1992). “Local wind loading on the roof of a low‐rise building.” J. Wind Engrg. Ind. Aerodyn., 45(1), 11–24.
3.
Blackmore, P. A. (1986). “Wind loads on pitch roof multi‐span buildings.” Bldg. Res. Establishment Note No. N120/86, Dept. of Envir., Garston, Watford, U.K.
4.
Durst, C. S. (1960). “Wind speeds over short periods of time.” Meteorology Magazine, 89(1), 181–186.
5.
Gerhardt, H. J., and Kramer, C. (1984). “Windlasten auf nach innen geneigten dachflächen.” Bauingenieur, Germany, 59(1), 53–59 (in German).
6.
Holmes, J. D. (1983). “Wind loads on low‐rise buildings—a review.” Rep., Div. of Build. Res., Commonwealth Scientific and Industrial Research Organization (CSIRO), Melbourne, Australia.
7.
Holmes, J. D. (1984). “Wind loading of single‐ and multi‐span industrial buildings.” Internal Rep. No. 84/14, Div. of Build. Res., Commonwealth Scientific and Industrial Research Organization (CSIRO), Melbourne, Australia.
8.
Hoxey, R. P., and Moran, P. (1983). “A full‐scale study of the geometric parameters that influence wind loads on low‐rise buildings.” J. Wind Engrg. Ind. Aerodyn., 13(1), 277–288.
9.
“Minimum design loads for buildings and other structures.” (1990). ANSI/ASCE 7‐88, ASCE, New York, N.Y.
10.
“Minimum design loads on structures. Part 2—wind forces.” (1989). AS 1170.2, Standards Association of Australia, Sydney, Australia.
11.
Saathoff, P., and Stathopoulos, T. (1992). “Wind loads on buildings with sawtooth roofs.” J. Struct. Engrg., ASCE, 118(2), 429–446.
12.
Stathopoulos, T., and Saathoff, P. (1991). “Wind pressure on roofs of various geometries.” J. Wind Engrg. Ind. Aerodyn., 38(2, 3), 273–284.
13.
“Supplement to the National Building Code of Canada 1990.” (1990). Assoc. Committee on the Nat. Build. Code, Nat. Res. Council of Canada, Ottawa, Canada.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 120 • Issue 8 • August 1994
Pages: 2495 - 2519
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Aug 19, 1992
Published online: Aug 1, 1994
Published in print: Aug 1994
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.