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## Re: [TowerTalk] Guyed towers flexible restrains

 To: 'Hank Lonberg' , towertalk@contesting.com Re: [TowerTalk] Guyed towers flexible restrains Mark Foigel Mon, 29 Jan 2007 20:39:20 +0100
 Thanks a lot Hank, tha is helping. Regards, Mark -----Original Message----- From: Hank Lonberg [mailto:kr7x@comcast.net] Sent: Sunday, January 28, 2007 8:57 PM To: 'Mark Foigel'; towertalk@contesting.com Subject: RE: [TowerTalk] Guyed towers flexible restrains Mark: The guys in a guyed tower are actually non-linear. It is difficult to assign a spring constant to them. I model guyed towers in my FEA programs with the guys as tension only cables the programs also allow for the catenary behavior. The analysis is iterative until a lower limit of error is attained something on the order of 0.01 pounds for summation of forces in equilibrium. A ball park number may be say 0.6 of the breaking force with say 1" of elongation. They are steel so you could use steel's stress-strains characteristics as long as you are below the elastic limit. The conservative hand calculation assumption of a pinned support gives a little larger bending moments in the tower sections or mast but that falls with the assumption of pinned supports with no lateral deflection. Regards Lonberg Design Group, Ltd. H.S. Lonberg, P.E.,S.E. / KR7X President -----Original Message----- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On Behalf Of Mark Foigel Sent: Sunday, January 28, 2007 11:39 AM To: towertalk@contesting.com Subject: [TowerTalk] Guyed towers flexible restrains Importance: High Hi, Computing the mast itself: What will be the adequate model so to assess rigidity of the partial restrains ("spring type"), as normally provided by the guys in a continuous beam model assumption for the mast? Appreciate a lot, Mark -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.410 / Virus Database: 268.17.12/654 - Release Date: 27/01/2007 -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.12/653 - Release Date: 1/26/2007 11:11 AM -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.12/653 - Release Date: 1/26/2007 11:11 AM ############################################################################ ######### This Mail Was Scanned by 012.net AntiVirus Service1- Powered by TrendMicro Interscan -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.410 / Virus Database: 268.17.12/654 - Release Date: 27/01/2007 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.410 / Virus Database: 268.17.14/658 - Release Date: 29/01/2007 _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk
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