Dennis:
The correct standard is ANSI/TIA 222-G. See below for url's
to both TIA and IHS global where you can buy the standard. Be
prepared that it is not cheap. Maybe if you google the tia 222
g you can find it for free as a pdf download but I believe it
is copyrighted by the TIA.
http://www.tiaonline.org/
http://global.ihs.com/?RID=DM&MID=R340&ocid=retail_aware
Regards
Lonberg Design Group, Ltd.
Hank Lonberg, P.E.,S.E. / KR7X
President
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of
yetiguy@earthlink.net
Sent: Saturday, February 20, 2010 11:49 AM
To: Tower and HF antenna construction topics.; 'Tower and HF
antenna construction topics.'
Subject: Re: [TowerTalk] wind load
Where can one order a copy of EIA RS-222-G? The Electronic
Industries Association seems to have evaporated. Then, I
checked the ANSI site eStore for this spec with no joy. Not
even a reference.
Dennis, K6IFB
-----Original Message-----
>From: Mike <noddy1211@sbcglobal.net>
>Sent: Feb 18, 2010 11:29 PM
>To: "'Tower and HF antenna construction topics.'"
<towertalk@contesting.com>
>Subject: Re: [TowerTalk] wind load
>
>WIND LOADING: Engineering analysis indicates the tower will
support 23
>square feet of projected area at 85 MPH 3 second gust wind
speed per
>ANSI/TIA EIA RS
>222 Rev. G.
>
>Does not matter what you think or feel, all that matters to
the local city
>these days is the example above.
>
>Mike
>
>-----Original Message-----
>
>
>Hi Rex et al
>
>Yeah, but for how long?
>
>I've always wondered if that is a sustained 70 mph wind for 5
hours or a
>gust or 2 at that speed. 73
>Tom W7WHY
>
>
>
>
>I believe it's saying that at 70MPH, the tower will support
15 sqft of
>antenna/mast/whatever is put on it. Most antennas will
specify effective
>"wind load" in square feet of "projected area."
>
> -Rex-
>
> K1HI
>Rex Lint
> Merrimack, NH
>
>
>I've been looking at various tower specifications, and often
see
>something like this
>
>Maximum Wind Load
>70 MPH 15 sq. ft.
>
>I don't really understand how to interpret this. I think a
wind load
>is a (static) force, and therefore should be measured in
either
>newtons or pounds. IIUC, it should be proportional to the
square of
>the wind speed and that the constant of proportionality
should itself
>be proportional to the cross-sectional area to the wind. So
15 sq ft
>is an area, and 70 MPH is a wind speed, but I'm still missing
some
>factors in order to calculate a force.
>
>Can anyone shed some light?
>
>73s
>
>
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