Snow Loads on Sloped Roofs
Publication: Journal of Structural Engineering
Volume 114, Issue 3
Abstract
Snow slides off unobstructed slippery sloped roofs, but this behavior is not adequately quantified. As a result, most building codes and standards require slippery sloped roofs to be designed for excessively large snow loads, and dynamic forces imposed by snow sliding from slippery sloped roofs are approximated. We propose design recommendations using the results from a field investigation, wherein the effects of slope and thermal environment are measured independently of other snow accumulation factors. Data from instrumented sloped roofs are combined with observations from a group of similar structures. A flat‐roof building with four different thermal conditions is monitored as a control for the sloped roofs. Results are widely applicable since the field site has significant snow accumulation during the years of study. Regression analysis is used to formulate new sloped roof coefficients; the coefficient errors are normally distributed.
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References
1.
Allen, D. E. (1959). “Snow loads on buildings.” NRCC Tech. Trans. 830, Nat. Resour. Council of Canada, Ottawa, Canada (translation of seven Russian papers).
2.
American national standard—Minimum design loads for buildings and other structures. (1982). A58‐1‐1982, American National Standards Inst., New York, N.Y.
3.
Haldeman, J. S. (1986). “Predicting sloped roof snow loads using artificial snow.” Thesis presented to the Department of Civil Engineering of the University of Idaho, at Moscow, Idaho, in partial fulfillment of the requirements for the degree of Master of Science.
4.
Isyumov, N., and Davenport, A. G. (1974). “A probabilistic approach to the prediction of snow loads.” Can. J. Civ. Engrg., 1, 28–49.
5.
Lutes, D. A., and Schriever, W. R. (1971). “Snow accumulations in Canada: Case histories II.” Tech. Paper 339, NRCC No. 11915, Div. Bldg. Resour., Natural Resour. Council of Canada, Ottawa, Ontario, 1–17.
6.
O'Rourke, M. J., Koch, P., and Redfield, R. (1983). “Analysis of roof snow load case studies, uniform loads.” CRREL Report 83‐1, Hanover, N.H.
7.
O'Rourke, M. J., and Stiefel, U. (1983). “Roof snow loads for structural design.” J. Struct. Engrg., ASCE, 109(7), 1527–1537.
8.
Peter, B. B. W., Dalgliesh, W. A., and Schriever, W. R. (1963). “Variation of snow loads on roofs.” Trans., Engrg. Inst. Can., 6(A‐1), 1–11.
9.
Pinkard, J. J. (1985). “Prediction of snow loads on sloped roofs.” Thesis presented to the Department of Civil Engineering of the University of Idaho, at Moscow, Idaho, in partial fulfillment of the requirements for the degree of Master of Science.
10.
Sack, R. L. (1986). “Improved data base and methodology for predicting snow loads.” NSF Report No. NSF/ENG‐86029, NTIS No. PB87‐181715/A09 Final Project Report, Grant. CEE‐8300465.
11.
Sack, R. L., and Sheikh‐Taheri, A. (1986). Ground and roof snow loads for Idaho. Department of Civil Engineering, University of Idaho, Moscow, Idaho.
12.
Sack, R. L., Arnholtz, D., and Haldeman, J. S. (1987). “Sloped roof snow loads using simulation.” J. Struct. Engrg., ASCE, 113(8), 1820–1833.
13.
Schriever, W. R., Faucher, Y., and Lutes, D. A. (1967). “Snow accumulations in Canada: Case histories I.” Technical Paper 237, NRCC No. 9287, Div. Bldg. Resour., Natural Resour. Council of Canada, Ottawa, Ontario, 1–29.
14.
Supplement to the national building code of Canada 1985. (1985). Part 4 NRCC No. 23178, Assoc. Comm. Nat. Bldg. Code, Natural Resour. Council of Canada, Ottawa, Ontario.
15.
Taylor, D. A. (1980). “Roof snow loads in Canada.” Can. J. Civ. Engrg., 12(2), 334–343.
16.
Taylor, D. A. (1985). “Snow loads on sloping roofs: Two pilot studies in the Ottawa area.” Can. J. Civ. Engrg., 12(2), 334–343.
17.
Tobiasson, W., and Redfield, R. (1973). “Alaskan snow loads.” 24th Alaskan Science Conference, Univ. of Alaska, Fairbanks, Alaska.
18.
The uniform building code. (1985). International Conference of Building Officials, Whittier, Calif.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 114 • Issue 3 • March 1988
Pages: 501 - 517
Copyright
Copyright © 1988 ASCE.
History
Published online: Mar 1, 1988
Published in print: Mar 1988
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