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## [TowerTalk] Guying Designs

 To: [TowerTalk] Guying Designs jimi@designet.com (Jim Idelson) Mon, 29 Mar 1999 18:44:01 -0500
 ```Pat, Regarding the following message: >>I am musing over a sketch of a guyed tower, plan view, and wonder how the positioning of guy anchor points changes with sloped ground. Does one try to keep constant angle by all guys to the tower, by changing the anchor radius, or do you keep a constant distance to the anchor point, with the resulting different vertical angles? Also, if the ground rises a significant amount on one side, then for a 2 level guy system, the top guy, and the middle guy, assuming they would converge to a single point anchor, on level ground, intesect the real world sloping ground at two points that have significant spacing between them. In this instance, with sloped ground, do you anchor the top and middle guys at 2 locations? If the angles of different guys at, say, the center guy point on the tower, are different, and the guys are tensioned equally, there will be different horizontal and vertical force components attributable to each guy.....How do you deal with sloped ground when guying? K1IR: I believe that your objective will be to create a horizontal RESULTANT FORCE at the attachment point on the tower for each guy which is equal to the RESULTANT created when using the recommended anchor point. You will first decide on a location for your anchor on the ground. This point will be plus/minus in elevation and distance from the recommended standard location. Next, you will use your trig to calculate the horizontal components of force at each attachment point when the anchor is at the recommended position. The inputs to your calculation are the standard angles and guy tension. You will solve for new guy wire tensions using your proposed angles from the ground and the required horizontal force we just calculated. Finally, you'll calculate the angle that the rod needs to be at as it comes out of the ground. This will be the resultant of the combined guy wire force vectors at the anchor point on the ground. The result of this will be that guy wires anchored at a lower elevation and the same distance from the tower as in manufacturer's recommended anchor placement will have to be tighter, and the rod angle will be higher. The wires anchored at this location will contribute more compressive force on the tower than the other wires. You will also need a bigger block of concrete in this case, since there is more guy tension. If you have to put the guy anchor at a lower elevation, it's a good idea to move it further from the tower. This helps you balance the horizontal and compressive forces with the other guy wires. As you bring the anchor point lower and closer to the base, the horizontal forces become more and more difficult to control. Until it all falls down. Jim K1IR ps I'm an EE and an MBA, not and ME or a PE! But I think this still makes sense. ------------------------------------------------------- The Information Resource for Conferencing Professionals ------------------------------------------------------- James S. Idelson President DesigNET International, Inc. 96 Morse Road Sudbury, Massachusetts USA 01776 tel 978.443.5549 fax 978.443.2034 pager 800.362.0156 email jimi@designet.com web http://www.designet.com -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
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