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RE: Wind Load on Wood Fence[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Wind Load on Wood Fence
- From: "Ehrlich, Gary" <gehrlich(--nospam--at)nahb.com>
- Date: Thu, 18 Dec 2008 09:24:38 -0500
Jeff & Ralph,
Interestingly, I recently calculated the wind load on an 8’ freestanding masonry fence, 90mph Exposure B, using ASCE 7-05 Section 6.5.14. The point force I got for the worst-case scenario at the end zone (first 8 feet) of a very long (100 foot+) fence translated to a uniform pressure of 25.5 psf.
For the record, I assumed G=0.85, Kd=0.85, and I=0.87.
Took me 2 or 3 days to generate a matrix duplicating Figure 6-20 Case C. Although a good portion of that was fiddling with Excel and figuring out how to create little drop-down menus I could use to change occupancy category, exposure, and other things.
the 2009 International Builders' Show
Ha! You don't want to calculate the fundemental frequency of a wood fence post and the gust effect factor?
25 psf for a fence in downtown SF seams pretty high.
I'm with you Jeff. I have a similar little project right now
and a glance at 6.5.14 and its interminable references to references, etc.,
make me think it'll take as week and 50 pages and a Ph.D. just to get the
pressure that used to be simply 25 psf.
I was hoping there might be a
simplified procedure. The the 97 UBC allowed 75% of the normal force method for
fences less than 12'.
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