Mike,
I think what you are saying is the stength of the tower itself is not
changed, it is simply that whatever downforce is generated from torsional
load on a guyed tower is not present, and that such downforce is rather
small. I expect that force might be more useful on a pier pin perhaps.
I think Jim raises a point though in the differences that occur or may occur
when the torsional load is arrested a single point, in this case near the
base where the chain attaches, versus at a multiple points where guys
attach. I run a managed care organization, I'm not an engineer, but it
seems the only real difference is that the actual torsional movement at the
top of the tower may be somewhat greater than if it were guyed at several
places.
I'm at least glad that others have wondered about this.
Art
----- Original Message -----
From: <jimjarvis@optonline.net>
To: <towertalk@contesting.com>
Sent: Thursday, February 28, 2008 11:56 AM
Subject: Re: [TowerTalk] Q on guyed rotating towers
Comments bottom-postedFrom: "Arthur Trampler" <atrampler@att.net>Subject:
[TowerTalk] Q on guyed rotating towers<snip>From what I understand part of
the strength of a guyed tower is that torsional movement is converted into
down force by the guy wires tightening as they attempt to cover a greater
distance (as the tower twists).With a rotating guyed tower, is there some
sort of locking mechanism between the bearings and tower, at least in a
given "parked" position to allow this phenomenon to occur? Otherwise it
would seem that this benefit is lost as the guys are not attached to the
tower, but to the bearing rings.Help me out...maybe the difference in
strength is inconsequential or mitigated by other factors.Art, K?RO-0-The
strength of the tower is the strength of the tower, based on the materials
and design. LOADING on the tower comes from mass and surface area, as the
wind works on the structure. Loads are transferred into vertical compression
by the guy system. Torsional loading on a triangular tower indeed does add
to the down force somewhat, but this is quite small compared to the other
loads. Thus, a tower which rotates inside a ring-coupled guy system is
simply relieved of whatever torsion loading might otherwise be imposed upon
it. It is neither stronger nor weaker as a result.Make sense?n2ea
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