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[TowerTalk] stacking antennas & Rohn specs

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Subject: [TowerTalk] stacking antennas & Rohn specs
From: (T. A. Russell)
Date: Sun, 13 Jul 1997 08:09:53 -0600
Figuring Ultimate Tower Load

I recall being told that the limiting factor in (Rohn) tower 
specifications is the ultimate load bearing capacity of the
bottom section.  (I think this came from a Rohn sales 
engineer but I am not sure of his qualifications.)

IF this the case, then merely calculate the transposed
load from the tower, antennas, and guy wires.  This
involves a LOT of computation but should not be too

Remember, the guy wires transpose the horizontal 
load into vertical components born by the guy and
the tower, and horizontal components born by the
guy wires.

To my mind, bending moments calculated by multiplying
wind load and height are irrelevant.  Just sum all the
force vectors from each load (antenna and tower) and
see what the worst case is at the bottom of the tower.

de  Tom  N4KG

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