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## Re: [TowerTalk] Temporary Guys

 To: "towertalk@contesting.com" Re: [TowerTalk] Temporary Guys Al Kozakiewicz Mon, 4 Apr 2011 00:43:56 -0400 mailto:towertalk@contesting.com>
 ``` -----Original Message----- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On Behalf Of Donald Chester Sent: Monday, April 04, 2011 12:20 AM To: towertalk@contesting.com Subject: Re: [TowerTalk] Temporary Guys >Another must to avoid is tensioning the guys to maximum during hot weather, >since they contract during extreme cold, resulting in over-tension during >sub-freezing periods in winter. I've never erected a guyed tower, but I was curious about the engineering behind that. The thermal coefficient of expansion of steel is 0.00000645 in/in/def F. Calculating for 115' of guy wires, I come up with a change of 0.8901" for a 100 degree F swing in temperature. That might be a lot, but the tower (90' - I thought I read here recently that a 90' tower needs a 115' guy at the top) also shinks 0.6966" for the same swing in temperature. Without doing the trigonometry, that's something less than a quarter inch in total added "tension". Like I said, I have no personal experience, but that doesn't sound like a lot to me. Am I wrong? Al AB2ZY _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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