determining snow drift load in 1984
determining snow drift load in 1984
(OP)
what was the predominant code used to determine snow drift in the '80's
the old nys code only says to include drift but not how to calculate it.
thanks
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determining snow drift load in 1984
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RE: determining snow drift load in 1984
The following way was the predominant way we calculated snow drift: Because the code gave roof snow, we divided roof snow by .7 to get a ground snow load to be consistent with ASCE 7 and ANSI A58. Then we would take this derived ground snow load an plug it into the equations for drift height and snow density. There were many other engineers who did not take the roof snow load and divide by .7 to get a ground snow load. Many used the roof snow load in the equations for snow density and drift height. I think that dividing the roof snow of the old code by .7 was the correct approach, because that's what the state did when they converted to the IBC. The drift loads were often huge because of how conservative the NY snow loads are.
RE: determining snow drift load in 1984
Most western states used UBC, eastern BOCA and southern, SBC, with others the NBC. Wisconsin (from 1975 on) required a simple formula for snow drifting, which just last year switched over to IBC.
I hope this helps!
RE: determining snow drift load in 1984
It seems the original engineer ignored the snow drift...
RE: determining snow drift load in 1984