[TowerTalk] VOA tower demolition in HD

[Kimberly Elmore]

The link didn't make it for some reason, so I'll try again: https://www.youtube.com/watch?v=EiXmpbXkoWY
Kim N5OP

      From: Kimberly Elmore <cw_de_n5op at sbcglobal.net>
 To: "towertalk at contesting.com" <towertalk at contesting.com> 
 Sent: Thursday, April 7, 2016 9:15 AM
 Subject: Re: [TowerTalk] VOA tower demolition in HD
   
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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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 <towertalk at contesting.com> wrote:



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 
http://www.championradio.com/Gunnar-Olsen.pdf 

Cheers,
Steve      K7LXC
TOWER TECH
and 
championradio.com
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