[TowerTalk] Tower base dimensions - why?

[Alan C. Zack]

One thing to consider is what your Bldg Dept requires before they will 
issue a Bldg Permit.  In my case they required 90 MPH Wind Calcs to 
IBC-2000 specs.  I was going to order a tower from U.S. Towers but all 
they could provide were 70 MPH wind calcs to UBC-97 specs.  These were 
not acceptable to my Bldg Dept.  U.S. Towers does not have a full time 
PE on staff to do the wind calcs and told me they could get them from 
an outside P.E. for $250.00.  I gave them the OK to contact the 
outside P.E. but he was not able to provide them.
Guess what I'm trying to say is rather than seeing what all the 
options are find out first what will be accepted.
73 & GL

Jim Miller wrote:
> Your answer is exactly why I think the deeper base would be the most stable.
> Guess I didn't specify why in the original message.  Waiting to see what the
> engineers have to say.  Good luck with Ivan.  Looks like you will get real
> wet if nothing else.
> 
> 73, Jim
> 
> ----- Original Message ----- 
> From: <Cqtestk4xs at aol.com>
> To: <TOWERTALK at contesting.com>
> Sent: Thursday, September 09, 2004 9:04 PM
> Subject: Re: [TowerTalk] Tower base dimensions - why?
> 
> 
> 
>>One more thing to consider.....the push on the tower from the wind trying
> 
> to
> 
>>overturn the tower, trying to put it on its side.  The higher the tower
> 
> the
> 
>>more leverage on the base from the wind.  The bigger and deeper the  tower
> 
> the
> 
>>more resistance to the overturning momentum from the wind.  This,  of
> 
> course,
> 
>>is probably not very important if the tower is guyed, since the Rohn
>>catalogue only specifies a four foot hole for Rohn 55 at 200 feet.
>>
>>I'm not an engineer, so the above is in layman's terms. I'll let  you know
> 
> if
> 
>>a big base is important next week if Ivan hits the West coast of  FL.
>>
>>Bill K4XS
>>_______________________________________________

-- 
__________________________________________________________________________ 

Alan Zack
Amateur Radio Station K7ACZ
Las Vegas, Nevada, USA
Quality Engineer, The Boeing Company, Retired
Aviation Chief Warrant Officer, U.S. Coast Guard, Retired
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