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[TowerTalk] Arizona Ice Loading

Subject: [TowerTalk] Arizona Ice Loading
Date: Fri, 10 Mar 2006 16:30:43 +0000
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I sent you a *.pdf with ASCE 7-05 Chapter 10 Ice Loadings. It also includes an 
Ice Loading Map that shows for Arizona only the northern half of Coconino, 
Navajo and Apache counties have an Ice Loading requirement, the rest of Arizona 
do not. The ice loadings are from freezing rain and are for a 50-year mean 
recurrence interval. If you are above 5000 feet elevation then the likelyhood 
of freezing rain is unlikely. For your info the ice requirement in the above 
counties is 1/4" radial with 30 mph (3-sec) wind. 

As I said in my previous post when you consider ice loading and wind 
simultaneously the wind speed is the 30 mph and is reduced to 70% of its 
pressure at that speed and the ice dead load is reduced to 70% of its value. 
This is done to account for the very short term loading that this describes. 

The jist is you don't need to consider ice for your structure.

Lonberg Design Group, Ltd.

H.S. Lonberg, P.E.,S.E. / KR7X

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