Re: [TowerTalk] Fall Zone

[Ron Baran <ronbaran@hotmail.com>]

I think of a crank up tower with a DB18 atop as a work of kinetic art.  I can 
understand that others may not appreciate it but I'm hoping that no takes a 
saws-all to the base.  The maim issue with all towers is their safety.  I've 
seen lots of towers that were under guyed, over loaded with antennas and poorly 
maintained.  A municipality has every obligation to insist that a tower conform 
to wind loading requirements of all other structures in the jurisdiction.

When you dropped the 200 foot guyed tower by severing one set of guys you 
turned it into a free standing tower with a large amount of force pulling it 
over.  Free standing towers, especially monopole towers, tend to fail at the 
base.  Way too much pressure on what is usually a set of bolts.

I'm kind of interested in any engineering research into tower failures.

I've seen photos of an earlier version of my tower that, indeed, failed between 
sections two and three of a four section tower.  Severely overloaded when a 
squall showed up unannounced.

Thanks for your comments Wilson.

73,

Ron
W9XS


________________________________
From: TowerTalk <towertalk-bounces@contesting.com> on behalf of Wilson Lamb 
<infomet@embarqmail.com>
Sent: Monday, July 8, 2019 10:20 AM
To: undefined
Subject: [TowerTalk] Fall Zone

I wouldn't want a neighbor's tower/Yagi looming over my backyard...and I love 
towers!
The fall zone idea seems like simple good manners.
 I have been loosely involved in dropping 200' BC towers, dropped by cutting 
the rods at one guy anchor, thus losing all guys on that side.
They fell absolutely full length, with a few sections not even bent!
I think a foundation failure (soil, bolt, gin pole) would drop a crankup to 
full length.
Is there any experience available on this?
WL
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