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[TowerTalk] Guy tensioning questions

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Subject: [TowerTalk] Guy tensioning questions
From: (David O Hachadorian)
Date: Mon, 12 May 1997 13:19:57 EDT
On Mon, 12 May 1997 11:59 EST (David Hand) writes:
>.¡¦ظ dhand@DS9.MICRODES.COM
>I was reading the thread on guy tensioning and  a couple questions 
>to mind ...
>If  the guy points are not equal distance from the base  (my  case)   
>wont  the tension need to be  unequal?
>Given that each  guy is going to  exert a  horizontal  and a 
>(compressive) vertical  vector component . 
>If  the guy angle isnt  equal (I.E. some guys are  steeper  than 
>others ) 
>the vectors will add up  differently  so ....  
>If   the  lateral  components  are equal,   the  compressive  force  
> be and vice -versa.
>Humm .. I think  I just made a real  good case for setting them up to 
>be equal ....   but  I really 
>cant see that working  out  here.
>Second Question ....
>If  you used  4  guys  with equal spacing and  equal  tension on all 
>would you attach the  guys to the tower  to equalize  the compression  
>each  leg?  If you attached  two  guys to  any leg that leg  would 
>have twice the compression  on it, or am I  OTL (out to lunch)???
>I suspect that  the lateral  forces should  be  equalized  first  then 
>if the  compressive load is 
>with in  some  broad but unknown range  your OK  
>Anyone  have any ideas??
>Dave  WB4HYP
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I don't see any need to equalize the compression on each leg.
If you are forced to use asymmetrical guy positioning, then
adjust tension to equalize the lateral forces. If you depart
significantly from the manufacturer's recommended layout, you
(or your PE) should calculate your worst case
leg compressive force (steepest guy, highest wind, worst wind
direction, max ice) to make sure you
do not exceed the compressive force spec for the leg, or the
tension capability of the guy wire, or any other tower specs.

Rohn recommends four-way guying on their foldover towers, and
they show two guys attached to one of the legs, so the
compressive forces exerted by the guys are doubled on that leg.

Consider the source of the above advice. I'm an electrical engineer,
not mechanical, but I got a "B" in Statics (34 years ago).

Dave Hachadorian, K6LL

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