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@sbcglobal.net>
To: "towertalk@contesting.com" <towertalk@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@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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