I have a crank-up tower rated at 30 sq. ft. for a 50 mph wind. I have 20 ft. of chrome-molly mast with 4 ft. in the tower. I want to de-rate the wind load for 70 mph. How do I do this and what effect
Pay for a PE to work the numbers for you, Henry. If you will be going for a building permit, you'll have to do that anyway. I have a US Tower with similar specs to yours: 30 sq ft at 50 mph. I live i
Hi Henry, Let me think "outloud" about this for a minute or two. First, when the wind goes from 50 to 70 mph, the forces on objects (towers and beams) DOUBLES since it goes up with the square of the
That would be the safe/correct way to go. But, to give you a ball park guess, I'll go though a couple equations that everyone could apply to their particular case. Let's start with the 50 MPH vs. 70
Hi Henry: I don't like my OWN answer to this and I will revise it as follows: and beams) DOUBLES since it goes up with the square of the wind speed. assume the tower equals 20 square feet of load by
Author: Dick Green" <dick.green@valley.net (Dick Green)
Date: Sat, 17 Jan 1998 00:51:13 -0500
let's seen I don't think this is correct. I believe that the tower cross section is included in the standard engineering calculations to determine maximum antenna wind load. I'm no PE, but it looks t
Hi, As a data point regarding de-rating crank-up towers as a function of wind speed and mast height, here's the results of the calculations I did on my U.S. Tower HDX-589 based on the professional en
let's seen Tri-Ex provides this if requested. It's part of their drawings and calculations package. I don't recommend purchasing a tower without obtaining the permit to put it up first! FWIW it cost
That would be the safe/correct way to go. But, to give you a ball park guess, I'll go though a couple equations that everyone could apply to their particular case. Let's start with the 50 MPH vs. 70