Winter Wind Parameter for Snow Drifts
Publication: Journal of Structural Engineering
Volume 146, Issue 7
Abstract
The relationships in ASCE 7 for the determination of roof snow drift size are functions of the ground snow load and the upwind fetch of the snow source area. In a 2019 paper, O’Rourke and Cocca propose a new relationship for snow drift size that includes a new winter wind parameter along with current ground load and fetch parameters. An inclusion of the winter wind parameter would improve the accuracy of snow drift estimates. The O’Rourke and Cocca paper presents the winter wind parameter for about four dozen sites across the United States. For potential use in ASCE 7, one needs a map of the winter wind parameter for the whole United States. In the current paper, the winter wind parameters for 272 locations in the United States are used to develop a map suitable for use in the ASCE 7 standard. The paper also provides information of the expected change in the design drift size if the winter wind relationship were to be used in ASCE 7. It is shown that, on average, there would be a 15% reduction for an upwind fetch of 250 ft (1 ft = 30.48 cm).
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References
Amidror, I. 2002. “Scattered data interpolation methods for electronic imaging systems: A survey.” J. Electron. Imaging. 11 (2): 157–176. https://doi.org/10.1117/1.1455013.
ANSI (American National Standard Institute). 1982. American National Standard minimum design loads for buildings and other structures. ANSI A58.1. New York: ANSI.
ASCE. 2013. Minimum design loads for buildings and other structures. Reston, VA: ASCE.
ASCE. 2017. Minimum design loads and associated criteria for buildings and other structures. Reston, VA: ASCE.
Ellingwood, B., T. Galambos, J. MacGregor, and A. Cornell. 1980. Development of a probability based load criterion for American National Standard A58. Washington, DC: US Dept. of Commerce, National Bureau of Standards.
NOAA. n.d. “Integrated surface hourly (DSI-3505).” Accessed March 26, 2020. https://gcmd.nasa.gov/records/GCMD_gov.noaa.ncdc.C00532.html.
O’Rourke, M., and J. Cocca. 2019. “Improved snow drift relation.” J. Struct. Eng. 145 (5): 04019027. https://doi.org/10.1061/(ASCE)ST.1943-541X002278.
O’Rourke, M., R. Speck, and U. Steifel. 1985. “Drift snow loads on multi-level roofs.” J. Struct. Eng. 111 (2): 290–306. https://doi.org/10.1061/(ASCE)0733-9445(1985)111:2(290).
O’Rourke, M., W. Tobiasson, and E. Wood. 1986. “Proposed code provisions for drifted snow loads.” J. Struct. Eng. 112 (9): 2080–2092. https://doi.org/10.1061/(ASCE)0733-9445(1986)112:9(2080).
Shepard, D. 1968. “A two-dimensional interpolation function for irregularly-spaced data.” In Proc., 1968 ACM National Conf., 517–524. New York: Association for Computing Machinery. https://doi.org/10.1145/800186.810616.
SEAC (Structural Engineers Association of Colorado). 2016. Colorado design snow loads. Lakewood, CO: SEAC.
Tabler, R. 2003. Controlling blowing and drifting snow with snow fences and road design. Washington, DC: National Cooperative Highway Research Program: Transportation Research Board.
Thiis, T., and M. O’Rourke. 2015. “Model for snow loading on gable roofs.” J. Struct. Eng. https://doi.org/10.1061/(ASCE)ST.1943-541X0001286.
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©2020 American Society of Civil Engineers.
History
Received: Nov 1, 2018
Accepted: Nov 4, 2019
Published online: Apr 24, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 24, 2020
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