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Re: Guyed Tower

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     I have not designed a tower either but my thought on it is to model it
by :  if the ground support is point A and the tower connection is point B
and the cable at point A is not tangent to horizontal (very few would be)
then you will have to assume a longer arc length on the catenary such that
L/2 at the vertex "produces" the length and tangent angle desired at point
A.  Then you could work back and find the forces at the connection by a
function of x from point B.
     I may be stating the obvious with this but if not, hope this helps.

Greg
-----Original Message-----
From: Bob Hanson <hansonb(--nospam--at)hilberteng.com>
To: 'seaint(--nospam--at)seaint.org' <seaint(--nospam--at)seaint.org>
Date: Monday, August 02, 1999 2:26 PM
Subject: RE: Guyed Tower


>I am not an expert but using a computer program to model a guy has not been
>satisfactory unless the program is a high end performer.  I have found that
>use of Roark and other hand analysis techniques to be accurate for simple
>systems and was able to verify the loads and sags in the field with
>instruments. I have used pins at both ends of the cable.  I believe the
>statics and not the "computer" when it comes to cables.  The problem imho
>is that most software member models will not allow the user to create a
>pure cable and looks for a non zero number to place in its stiffness matrix
>where a cable needs a zero placed. (flexure)  imho
>Bob Hanson, SE
>
>-----Original Message-----
>From: SONSUR2(--nospam--at)aol.com [SMTP:SONSUR2(--nospam--at)aol.com]
>Sent: Tuesday, July 27, 1999 7:29 PM
>To: seaint(--nospam--at)seaint.org
>Subject: Guyed Tower
>
>I am analyzing a Guyed tower using computer program. Need somebody's expert
>opinion.
>At the point where Guy cables are attached shall I use as a pin connection
>or
>a spring joint, also what about at ground where the cables are anchored. I
>am
>getting quite different results
>Thanks in advance
>
>
>