Snow Loads on Gable Roofs
Publication: Journal of Structural Engineering
Volume 123, Issue 12
Abstract
An investigation of unbalanced or drifted snow loading on single gable roofs is presented. A database of 28 case histories was developed and analyzed to identify trends and key parameters for this type of roof snow drift. The analysis suggests that roof slope, roof width (i.e., ridge to eave distance), and ground snow load are the key parameters influencing drift size. Furthermore, substantial drifts near the eaves of low sloped roofs (slope less than 15°) are possible, particularly if the width is large and the ground snow load is moderate. A number of simple relations were developed that can be used to predict the total height for low sloped roofs. Predicted values from these relations were compared with observed values to gauge their relative accuracy. It is felt that the simple relations developed herein are an improvement over current code provisions, specifically for low sloped gable roofs. It is expected that they will be the basis for proposed changes in building codes and load standards. The implications of the proposed changes are illustrated in a design example.
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References
1.
ASCE. (1996). Minimum design loads for buildings and other structures. ASCE 7-95, Reston, Va.
2.
Chin, R., Gouwans, J., and Hanson, M. (1980). Review of roof failures in the Chicago area under heavy snow loads. ASCE, Reston, Va.
3.
Factory Mutual Engineering. (1991). “Roof loads for new construction.”Loss prevention data 1–54. Norwood, Mass.
4.
Faherty, K. F. (1980). Failure of wood roof systems under snow load. ASCE, Reston, Va.
5.
Lorenzen, R. T. (1970). “Observations of snow and wind loads precipitant to building failures in New York State 1969–1970.”ASAE paper no. NA 70-305, ASAE, St. Joseph, Mich.
6.
O'Rourke, M., Speck, R., and Stiefel, U.(1985). “Drift snow loads on multilevel roofs.”J. Struct. Engrg., ASCE, 111(2), 290–306.
7.
O'Rourke, M., Tobiasson, W., and Wood, E.(1986). “Proposed code provisions for drifted snow loads.”J. Struct. Engrg., ASCE, 112(9), 2080–2092.
8.
Shriever, W. R., Faucher, Y., and Lutes, D. A. (1967). “Snow accumulations in Canada case histories: I. technical paper no. 237.” Div. of Build. Res., Nat. Res. Council of Canada, Ottawa, Canada.
9.
Taylor, D. A.(1979). “A survey of snow loads on roofs on arena type buildings in Canada.”Can. J. Civ. Engrg., 6(1), 85–96.
10.
Tobiasson, W., and Greatorex, A. (1996). “Data and methodology for conducting site specific snow load case studies for the United States.”Proc., 3rd Int. Snow Engrg. Conf., A. A. Balkema, Rotterdam, 249–256.
11.
Walton, C. (1990). “Cases of structural damage attributed to snow on roofs in the U.K. 1964–1984. Build. Res. Establishment Note N57/90, Watford, England.
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Copyright © 1997 American Society of Civil Engineers.
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Published online: Dec 1, 1997
Published in print: Dec 1997
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