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[TowerTalk] Fwd: Guy Wire Tension Calculation

To: towertalk@contesting.com
Subject: [TowerTalk] Fwd: Guy Wire Tension Calculation
From: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Reply-to: Hans Hammarquist <hanslg@aol.com>
Date: Sat, 21 Sep 2019 04:57:50 +0000 (UTC)
List-post: <mailto:towertalk@contesting.com>
 Hi Scott,
I don't have the reference but I did some calculations myself some years ago. I 
don't remember the exact numbers but the 1.15 factor is right. If that happens 
at 30 degrees or if it was 15 I can't recall, the 1.15 factor is correct.
The explanation is that when the wind attacks the tower 30 degrees off the guy 
wire facing the wind, one of the guy wires, on the other side of the tower, 
will pull on the tower sidewise and will increase the tension in the wire 
facing the wind. 

Now, the 15% increase in the guy wire tension isn't that much. You, presumingly 
have a much larger safety margin, so an additional 15% should not be the 
factor, collapsing the tower.
73 de,
Hans - N2JFS
 
 
-----Original Message-----
From: K9MA <k9ma@sdellington.us>
To: towertalk@contesting.com <towertalk@contesting.com>
Sent: Fri, Sep 20, 2019 10:30 pm
Subject: [TowerTalk] Guy Wire Tension Calculation

Does anyone have a reference for calculating worst-case guy wire tension 
for a 3-wire system? The only thing I'm unsure of is the effect of wind 
direction. One source states that worst case is for wind 30 degrees one 
side of a guy, and is 1.15 times the force with the wind aligned with 
the guy.  The 1.15 factor is easy to calculate, but is that really the 
worst case?. It's also clear that, with the wind exactly between two 
guys, the tension in each is the same as when the wind is aligned with 
one guy. Whether 30 degrees really is the worst case direction seems a 
non-trivial calculation.

Note that I'm not asking about calculating the effect of vertical angle, 
etc., as that's straight-forward. I'm just interested in the worst case 
horizontal component of guy wire tension as a function of wind direction.

73,

Scott K9MA

-- 
Scott  K9MA

k9ma@sdellington.us

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