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uplift per ASCE 7-05

uplift per ASCE 7-05

uplift per ASCE 7-05

(OP)
I have a stick built roof system that is entirely supported by post and beam.  I am using ASCE 7-05 to analyze uplift on the roof.  There ends up being quite a large uplift, 13kips, on one of the posts due to multiple beams coming in at one point.  Can I take credit for the roof, timber beam, and column dead wieghts and subtract this from the ASCE 7-05 uplift loads? I don't find any explanation in ASCE. I see in 2003IRC there is a note that their uplift values allready include a consideration for 10psf dead load.  If I can't subtract these dead loads then I suppose all of this uplift needs to be resisted by a mass of concrete at the fndn? Is there a way to tie the column to intermediate floor diaphrams for additional dead weight, I've never seen this done? 13,000# is a lot of concrete...

Thanks guys,

RE: uplift per ASCE 7-05

It is perfectly OK to subtract 0.6*DL from the uplift.

DaveAtkins

RE: uplift per ASCE 7-05

The uplift loads in ASCE7 do not account for any dead load.  As DaveAtkins said, it is fine to consider 0.6*DL to reduce the uplift.

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