Need a book? Engineering books recommendations...

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

25% snow load is Conservative

[Subject Prev][Subject Next][Thread Prev][Thread Next]
I know not many people deal with lateral forces due to large snow loads, but
those of who do might find this interesting.

You can imagine the enormous lateral loads if you were to count even part of a
400psf snow load toward seismic.

Compounding this, the code is unclear on how much snow load to count toward
seismic in heavy snow country.  It says, at the discretion of the building
official, the amount of snow counted toward seismic may be reduced to 25%.

Some counties have chosen to go big, such as Placer Co @ 1/3rd and Amador Co
(kirkwood) @ 1/2!  In addition, the snow loads in these areas are routinely
above 300 psf.

As someone has said previously (Lew Midlam?) Where are the bodies?

A recent article in ICBO Bld. Standards, Mar-April '98, clearly, rationally
articulates why 25% of snow is CONSERVATIVE.  It's all Stats 101.

So if there are any code authors out there, how about addressing this in 2000?

Brian Veit, P.E.