] [Thread] [Date] [Author]

[Scott Maxwell <smaxwell(--nospam--at)engin.umich.edu>]

My assumption is that it is a stregth load level, as most (if not all)
seismic forces in the the 97 UBC and IBC codes.

And I don't think that you factor the D+L.  Consider it a seismic weight
(or "mass") similar to the W in the main seismic force equations for the
entire building.  W (building weight...but really should be mass) used in
the main seismic equations is generally just the dead weight of the
buildings (i.e. dead load), but portions of live load and snow load can be
added in under certain situations...AND none of the W "loading" is
factored.

HTH,

Scott
Ypsilanti, MI


On Fri, 20 Feb 2004 ECVAl3(--nospam--at)aol.com wrote:

> RE: equations .5*Ca*I* D and  .5*Ca*I*(D+L) {.3*Ca*I according to  the Blue
> Book)
> I did assume the D & L loads in the formulas were Strength  Design.
> The reason I questioned it was they don't seem to require factoring the D +
> L as per Section 1612.2.1
> Do you read it like this also?
> Macie
>


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