See Modeling, Loading, and Preliminary Design Considerations for Tall
Guyed Towers, by Gantes, Khoury, Connor and Pouangare, Computers and
Structures, v. 49, No. 5, pp.797-805, 1993
in which the authors summarize the results of an investigation they
carried out on a the collapse of a 1900 foot tall guyed structure under
ice and wind loads. The tower was 9 ft. per side and had a maximum
thickness of 10 inches of ice at the top. Figure 2 appears to show that
the tower debris were within 80% of a circle the length of the guy lines.
Unfortunately, I haven't found mention of the guying radius. However, if
the guying were 80% and the debris field is within 80% of that, that
would be 64%.
If you are willing to download the eFax reader, I can send it as an
attachment to you and you will have as good a copy as I have.
Politically, think about how to cut a deal. You might choose to agree to
a 1:1 setback, if it begins at a height of 50 feet, i.e., at 70 feet a
tower could be 20 feet from a side-lot line. You might agree to a 2:1
setback, if it begins at 100'! In that case, a 150 foot tower must be 100
feet from a side-lot line. Obviously, you could think of other
variations.
Fred Hopengarten K1VR hopengarten@post.harvard.edu
Six Willarch Road * Lincoln, MA 01773-5105
781/259-0088 *eFax 419/858-2421
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