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Re: Wind Load on Wood Fence

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Oh, I do, I do!!  My clients definitely hire me to perform fundamental research on such critical, essential, and vital, lifesaving structures as 6' fences.  You betcham. 

And I am sooooo glad that we have Powers That Be who feel it necessary to require us to jump through such hoops. 

I just picked the 25 out of the air, altho I do recall that a long time ago most of the residences I deigned used a wind pressure of 25 psf, without 50 pages of research to arrive at.


In a message dated 12/17/08 6:16:58 PM, jeffsmith7(--nospam--at) writes:
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.

From: Rhkratzse(--nospam--at) [mailto:Rhkratzse(--nospam--at)]
Sent: Wednesday, December 17, 2008 6:09 PM
To: jeffsmith7(--nospam--at); seaint(--nospam--at)
Subject: Re: Wind Load on Wood Fence

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.


In a message dated 12/17/08 6:04:37 PM, jeffsmith7(--nospam--at) writes:

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'.

From: Conrad Harrison [mailto:sch.tectonic(--nospam--at)]
Sent: Wednesday, December 17, 2008 5:53 PM
To: seaint(--nospam--at)
Subject: RE: Wind Load on Wood Fence

Seems the right approach to me. We use pressures on free standing walls for fences. If open then use the drag force coefficients for open framing ( AS1170.2). When using ASCE7-05 looks like need to go elsewhere for open framing drag forces.
Conrad Harrison
B.Tech (mfg & mech), MIIE, gradTIEAust

South Australia

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