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RE: Seismic and snow

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Neil, you better check again, who ever you talked to
at the county did not know what they were talking
about.
Randy

--- Neil Moore <nmoore(--nospam--at)innercite.com> wrote:

> Douglas County, Nevada requires that 100% of the
> snow load be included in 
> the seismic design.
> 
> Neil Moore, S.E.
> 
> 
> At 09:56 AM 6/28/2005, Lutz, James wrote:
> >Although it makes intuitive sense that snow mass
> used in lateral force
> >calculations should also be counted in the
> resisting gravity load, I don't
> >think the code permits you to do it as written. It
> seems arbitrarily
> >conservative, but then counting only part of the
> snow load in the mass is a
> >little arbitrary, too.
> >
> >I think there are probably some parts of the
> country where  even though you
> >don't have to, I would include all the snow load. I
> used to live in a place
> >where the temperature hovered around freezing most
> of the winter and we went
> >through constant cycles of snow rain  freeze melt
> snow, etc. The roof load
> >was probably never high enough to trigger the code
> requirement to include
> >snow load in the seismic mass, but the added weight
> was up there on the top
> >of the structure just about all winter long in a
> Southeast Alaska seismic
> >zone.
> >
> >The point is, don't lose sleep over the
> conservatism in the load combo
> >formula.
> >
> >-----Original Message-----
> >From: Jason Christensen
> [mailto:jason.christensen(--nospam--at)es2eng.com]
> >Sent: Tuesday, June 28, 2005 8:14 AM
> >To: seaint(--nospam--at)seaint.org
> >Subject: Seismic and snow
> >
> >
> >Food for thought.
> >
> >I just designed a building that had a 100psf flat
> snow load, with a high
> >seismic area (SDC = D).  The building was of light
> frame construction with
> >wood shear walls.  I added the twenty percent of
> the snow into the design
> >base shear as prescribed by code.  Then when I
> designed my shear walls the
> >controlling load combo for uplift was 0.6*D +
> 0.7*E.  Here is my question,
> >another engineer I talked to mentioned using twenty
> percent of the snow load
> >in addition to the dead load for the uplift design.
>  His reasoning was 'if
> >the snow has been added to the seismic base shear
> then it will be there for
> >the uplift also'.  This makes sense to me, however
> I cannot find anything in
> >the code that would say this is ok.
> >
> >Your comments would be helpful.
> >
> >Jason
> >
> >
> >
> >
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