Bob,
I believe its been mentioned on TT that a new standard, TIA-
222-G comes into effect on January 1, 2006. This new standard
will be incorporated by reference into the International Building
Code (IBC). Most county and municipality building codes
require conformance with the UBC. Fortunately, it will take a
few years for the counties to incorporate the new UBC into their
building codes.
While copies of TIA-222-G can be purchased from TIA, they are
exceptionally expensive. However... there is a pdf
presentation on the web that contains many of the key
differences in TIA-222-G, including new wind and ice zone maps.
http://www.mei1inc.com/NAB-2003presentation.pdf
One of the changes is in the wind zones. TIA-222-G contains
over a hundred pages of wind and ice zone information for
every county in the US.
TIA-222-G has changed the way that windspeed is specified,
from the traditional "mile of wind" approach to a three second
maximum gust specification. The TIA-222-G minimum wind
speed requirement (applies to most counties in the US) is now
90 MPH three second gust, which is equivalent to a 75
MPH "mile of wind", 65 MPH sustained wind for 10 minutes or 62
MPH sustained wind for one hour.
Another aspect of TIA-222-G that could impact hams in the
future is the new requirement to evaluate the risk to human life
of new tower installations. When there is a risk to human life
(for example, if a tower could topple on a residence or a
populated area), the requirements become much more severe
than current standards. For a new tower in a location where
human life is not at risk, EIA-222-G is very similar to current
requirements
73!
Frank
W3LPL
---- Original message ----
>Date: Mon, 26 Sep 2005 17:05:07 -0400
>From: "ROBERT CARROLL" <w2wg@comcast.net>
>Subject: [TowerTalk] TIA Wind Zones
>To: <TowerTalk@contesting.com>
>
>Where can I find a map or listing of TIA Wind Zones?
>Bob W2WG
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|