[TowerTalk] H-beam for elevated guy

[Earl Morse]

I took a stab at this for grins.  

Using the classic Rohn 45 100' install with 1/4"EHS @ 91' and 3/16 EHS @ 31' & 61' and the anchors on an 80 foot radius.

I assumed an 8' elevated anchor and in keeping the guys at the same angles would move your guy radius in to 69.3 feet.

Using the breaking strength of the EHS guy wire 6000# and 3990# for 1/4" and 3/16" respectively and solving back to the elevated anchor point gives you 10,788 lbs in the horizontal direction and 8288 lbs in the vertical direction at that point.

Figuring in the moment arm of the 8' elevating structure for the anchor (8' x 10,788lb) gives you 86,304 lbs of lateral/shear? force at the point where the I-beam goes into the ground.

At that point it is even money whether the tower breaks, the guys snap, or the elevated anchor I-beam bends/breaks if you chose an I-beam rated at 86,000 lbs or psi or whatever.

Earl
N8SS

I'm not a mechanical or civil engineer but sometimes I play one on the internet.