From: "Colton" 
To: "Daniel Fundo" , 
Reply-To: "Colton" 


Thank you!
----- Original Message -----
From: "Daniel Fundo" 
To: 
Sent: Wednesday, August 20, 2003 12:19 AM Subject: Re: ATM 2 Piece Poles -
and how trusses really work


> <<  A quick question.  When you guys calculate the compression and
> tension of these poles using Young's Modulus and the cross sectional
> area, do you account for the tube being hollow?  I know that the
> equation can be used to figure out compression and tension on a solid
> item, but I didn't know it could be used on a hollow one.  Do you just
> use a different value for Young's Modulus if it is hollow, or are you
> just using the modulus for aluminum?  Or is everything the same.  >>
>
> Colton,  There is a factor called the 'moment of inertia' for the cross
> sectional area.  It takes into account that the structural member is
> hollow.
>
> If you're really into mental torture, find a copy of the American
> Institute for Steel Construction Manual (should be at the library) and
> look in the back.  EVERYTHING you ever wanted to
know............>
> The only difference between steel and aluminum in the calculations is
> the "E" factor, the modulus of elasticity.
>
> *****-----
> Dan F.
> Secretary/MAS
> Memphis, TN

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