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Tower Anchors
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by K5EWJ on September 27, 2006
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I am preparing to install a tower. Anyone have info on how much bending moment that a piece of 3" pipe will take?
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RE: Tower Anchors
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by KB9CRY on October 9, 2006
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Not much. Pipe is designed to carry fluids or gases and is built to withstand pressure equally distributed from within.
Post this same question on the TowerTalk reflector as you'll get better/wiser answers there.
Phil
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RE: Tower Anchors
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by vk2cz on October 15, 2006
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Pipe stiffness is defined as = G*(D squared)... so by doubling the Diameter of the pipe say to 6", the pipe is 4 times stiffer.
Interesting the stiffness of a tube is not much affected by the wall thickness, indeed a solid 3" diameter rod is only 30% stiffer than say a 3" pipe with a quarter inch wall.
Look to a flagpole for some guideance with regard to loading... you may only get to support a small HF yagi about 15' off the ground with a 3" pipe..
I know some steels seriously drop in strength when temperature drop below zero.. but have never had to worry about that here.. have a chat with a local structural engineer.. they can be friendly.. ;-}
David VK2CZ
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