[TowerTalk] self supporting tower question

[Red]

Hi, Mark;

If you deviate from the recommended installation specifications, 
especially if you with to make it less capable of supporting your tower, 
get a competent engineer to analyze it.  If anyone might be hurt or 
suffer property damage if it falls over, get a competent engineer to 
certify that the change does not create an unacceptable risk.

A commonly used assumption for determining the capacity of a tower base 
is to make the total weight, of base, tower, antennas, and the rest, 
times the minimum radius of the base greater than the maximum 
overturning moment (sum of forces times moment arms).  Add to this an 
asumption that the base is totally "floated" in the ground.  This method 
of calculating capacity generally provides a safe design without the 
cost and complexity of having an engineer measure soil characteristics 
and calculate capacity based on soil resistance.

Your total cost, or the amount you lose if it falls over, is usually 
much greater than the amount you can save by pouring less concrete.

Happy New Year es 73
WOØW

EL34GUY at aol.com wrote:

>Happy New Year to everyone,
> 
>I have a question on putting up an 80ft Rohn SSV tower. Id like to make my  
>base a little smaller then recommended to save money on concrete. Is it  
>possible to put down earth anchors in the hole and connect them to the cage to  gain 
>additional reinforcement? Ive read some things that suggest that this is  
>possible, but what have you guys experienced? Thanks alot. 73
> 
>Mark
>W0NCL
>_______________________________________________
>
>See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
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