Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: Snow Load + Seismic

[Subject Prev][Subject Next][Thread Prev][Thread Next]
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

From: Gerard Madden, SE [mailto:gmse4603(--nospam--at)]
Sent: Thursday, July 20, 2006 8:03 PM
To: seaint(--nospam--at)
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.