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Re: [TowerTalk] 10 inch tube 100ft wind load? NN7J

 To: towertalk@contesting.com Re: [TowerTalk] 10 inch tube 100ft wind load? NN7J "Dan Zimmerman N3OX" Thu, 31 Aug 2006 11:56:49 -0400
 ```Well, there are beam bending formulas for distributed loading... the windload of the structure itself is nonnegligible, but it's a simple beam so it's straightforward to analyze. Take the formula for windloading of a cylinder like you'd calculate for a yagi boom or something... calculate the total windload on the 10 inch 100 foot tall cylinder (proportional to (wind speed)^2 * frontal area), and divide by 100 feet. This gives you a distributed load in pounds per foot. Then calculate the total windload of the antenna system in pounds for the wind speed you're looking at, and add that as a point load at the end of your cantilevered beam. Beam bending formulas: http://www.engineersedge.com/beam_bending/beam_bending8.htm (distributed load) http://www.engineersedge.com/beam_bending/beam_bending9.htm (point load) Superposition applies, so you can calculate the two stresses individually and add them. Then you need to make sure that none of the stresses exceed the yield stress of the materials involved. Calculate at your own risk! Use a healthy safety factor! Dan _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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