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RE: Snow Load + Seismic

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Look at the definition of W for the seismic lateral load equations.  ASCE 7-05 defines W to include 20 percent of the snow load in the mass - not sure about 2001 CBC.
 
Bill Sherman
CH2M HILL / DEN
720-286-2792
 


From: Gerard Madden, SE [mailto:gmse4603(--nospam--at)gmail.com]
Sent: Thursday, July 20, 2006 8:03 PM
To: seaint(--nospam--at)seaint.org
Subject: Snow Load + Seismic

2001 CBC section 1612.2.1 (LRFD)

Section 1612.3.2 (ASD Load)


I have a project with a 40 psf snow load. Therefore, the S value must be combined with the E/1.4 in the ASD value and I may reduce it up to 75%.

What I am not clear about is if the mass of the snow is included in the E value. I read this as Snow is not a part of Seismic Dead Load.

I have done projects in Alaska under IBC a few years back where I had to include 50% of the snow load as seismic mass, but the building department I'm dealing with does not state that in their webpage of code requirements.

what do you think? The structure is a residence with a simple 6/12 gable roof.

TIA,
-gm