Structural snow loads

TitleStructural snow loads
Publication TypeConference Proceedings
Year of Conference1983
AuthorsSack, R. L., and Inverso G.
Conference Name51st Annual Western Snow Conference
Series TitleProceedings of the 51st Annual Western Snow Conference
Date PublishedApril 1983
PublisherWestern Snow Conference
Conference LocationVancouver, Washington
KeywordsBuilding codes, Roof snow loads, Snow load codes, Snow loads, Structural snow loads, Thermal effects

Snow loads on flat roofs are affected by local conditions, as well as the roof geometry, wind exposure and thermal environments. The dimensionless thermal factor Ct proposed by American National Standards Institute is examined in this study. Continuously monitored heat flux and temperature data for a structure with four distinct thermal environments were combined with National Weather Service data and snow core samples from the roof and ground during the winter of 1982-83. Models were developed based on these data and a standard energy balance to predict snow load for the four roof enviromnents and the ground. Ground-to-roof thermal conversion factors (Ct), both predicted and observed, were found to be a function of roof heat flux and substantially higher than those recommended by the American National Standards Institute.