[TowerTalk] wind load vs Rohn specs

[Al Williams]

Please, will someone define just what is meant by projected area and
windload.  Also, what is the relationship between the two? (not in terms of
numbers but in words).  Is there a place on the internet where this
information is available?

I am trying to follow the analysis for Triex LM470 and US Tower HDX572.
Although I have two engineering degrees,  some of the terms and
abbreviations used by the structural and civil engineers are unfamiliar to
me.  What is Cq, Qs, Ce, fa, Fa?  Also, Triex analysis has all of the tower
section loads stated as "Unif. Load" whereas the antennas and mast loads are
stated as "Con. Load".

Tower Talk seems the perfect place for this topic!

k7puc

----- Original Message -----
From: "Pete Brunet/Austin/IBM" <brunet@us.ibm.com>
To: <towertalk@contesting.com>
Sent: Friday, September 01, 2000 7:26 PM
Subject: Re: [TowerTalk] wind load vs Rohn specs


>
> >Pete, You are in the wrong code. There is no .67  To get the ROHN assumed
> EPA value you multiply their are by 1.2 for rounds and 2.0 for flats.
>
>
> According to the Force 12 brochure they start by knowing their antenna's
> projected area.  The generate their windload number by multiplying their
> projected area by .67 and they publish that number in their brochure.  In
> order to know what projected area they started with I would have to
> multiply their windload by 1.5.  Make sense?
>
> If I know their projected area, can I assume that since it is a round
> member antenna I can use the round member spec?
>
> The antenna is 30' of Rohn 25.  My zone is rated 70 mph.  The shortest
> tower I see in their manual is 40' so I will use those numbers.
>
> Concerning the coax, let's forget about it and say that our configuration
> will be close to the Rohn configuration.  Besides the antenna, what other
> top of tower items will a PE want to know about, e.g. mast and rotator?
>
> Thanks, Pete ws4g
>
>
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