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Re: [TowerTalk] VOA tower demolition in HD

To: "" <>
Subject: Re: [TowerTalk] VOA tower demolition in HD
From: Kimberly Elmore <>
Reply-to: Kimberly Elmore <>
Date: Thu, 7 Apr 2016 14:15:26 +0000 (UTC)
List-post: <">>
Fortunately, I have no direct experience with tower failures but did see the 
results of s very tall TV tower failure. It was in (I think) 1987 or so. KTUL 
TV in Tulsa had the tallest tower at the time (~2000 ft). During a winter storm 
 the tower was in supercooled liquid cloud and accumulated a very large amount 
of ice on the upper half. The tower failed in compression and fell pretty much 
in a heap constrained by the guys. There's a short, marginally informative 
video made by the station that can be seen at KTUL Tower Collapse
|   |
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| KTUL Tower Collapse |
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| View on | Preview by Yahoo |
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Kim N5OP

"People that make music together cannot be enemies, at least as long as the 
music lasts." -- Paul Hindemith

On Apr 7, 2016, at 08:51, K7LXC--- via TowerTalk <> 

Probably many of you have already seen this, but this is a HD  version 

with more views of the tower demolition. 

I have one question.  I've always heard that when a really tall tower 

comes down, it basically  collapses onto itself and doesn't fall as one solid 
unit extending out the  height of the tower. Watching this, I see many of the 
towers didn't collapse  into one small area but went down as a full unit.

 There was a  NJ engineering firm study done 25-30 years ago on tower 

failures.   It  was mostly about commercial towers more than 200' high.  They 
all fell  within 30% of their height.   I think they were mostly guyed  
towers.  You may find that K1VR referenced it in his book on antenna zoning  
issues.   I assume there must be something done more  recently.

    This is known as the Gunnar Olsen study. A copy of  it is at 

Steve      K7LXC

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