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[TowerTalk] Calculating Wind Loads

To: <>
Subject: [TowerTalk] Calculating Wind Loads
From: (
Date: Mon, 14 Jul 1997 19:41:48 -0400 (EDT)
In a message dated 97-07-14 18:47:52 EDT, you write:

> Hi, Jim Cain, new to the list here, and with a few questions on designing
>       for wind loads....

Hi, Jim --

     THE Jim Cain? Welcome to TowerTalk.
>  1.  Is there a preferred technique for calculating the pressure on a 
>       structure from wind loads?  I have pulled a few wind engineering
>       texts and just wondered if there is a more direct or preferred 
>       technique ?
     Are you asking specifically about towers or pressure in general?

>  2.  I have seen the map of the US with wind velocities posted on it.
>       Is there a better way to convert from wind velocity to wind
>       pressure, than using Bernoulli's equation?  What method would
>       you suggest ?

     How about:

10 psf      50 mph
14.4 psf    60 mph
20 psf       70.7 mph
30 psf       86.6 mph
40 psf      100 mph
50 psf      111.8 mph

     Let me know if you need more.
>  3.  Any advice on accounting for lattice work structures vs. solid
>       surface structures would also be appreciate.  Basically I am
>       just trying to come up to speed on this whole wind load
>       thing. 

     Take your antenna load and look up the Rohn (or other manufacturer's
specs) and make some intelligent decisions. BTW, possession of the Rohn
catalog is the first thing you should have if you're going to be doing any
tower planning/speculation. It's a wealth of technical and construction data
that's useful even if you don't put up a Rohn tower. TOWER TECH has them for
five bucks. (TOWER TECH, Box 572, Woodinville, WA, 98072).

73 and keep the questions coming,  Steve  K7LXC

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