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Structural snow loads
Submitted by Armida on Fri, 02/15/2013 - 15:27
|Structural snow loads
|Year of Conference
|Sack, R. L., and Inverso G.
|51st Annual Western Snow Conference
|Proceedings of the 51st Annual Western Snow Conference
|Western Snow Conference
|Building 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.