Is the shrinkage of the tower factored into the figures below???
On Tue, 24 Dec 1996 K7LXC@aol.com wrote:
> In a message dated 96-12-24 09:42:37 EST, you write:
>
> >Ok...Here is another dumb questions I've always wondered about!
>
> This isn't a dumb question at all!
> >
> >How does cold temperatures affect guy wires? Do they shrink in cold and
> >expand in hot?
> >
> Yes they do. The only example I have is for 1/4 inch EHS; maybe one of
> our more engineering enlightened tower heads can fill in the 3/16 info (I've
> got the formulas if anyone's interested).
>
> >Now... I use to have 1/4 inch guys on the tower several years ago that dod
> >just that. Well, this time when I put up the tower I purchase new guy wire
> >(the other stuff was hard to work with and I didn't need all that guys wire
> >for a 60 foot tower...besides, I hade saddle and clamps...so I moved on to
> >grips). I've been checking them now that the temp has been at 5 to 10
> >degrees for the past week and they have not tighted like the old guys.
>
> Here's the 1/4 inch EHS info:
>
> Temp. Pounds tension
> 120 502#
> 90 583#
> 60 665#
> 30 747#
> 0 829#
>
> These figures assume initial tension of 665# at 60 degrees F and for guys
> which are 45 degrees to the horizontal.
>
> You can see how they contract in cold weather and the tension goes up.
> If you do your erection in any of those temperatures, the initial tension
> should correspond to this temperature corrected figure.
>
> 73, Steve K7LXC
>
> TOWER TECH -- professional tower supplies and services for amateurs
>
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