Re: ATM 2 Piece Poles - and how trusses really work

["Colton" <clnoble@email.arizona.edu>]

Thank you!
----- Original Message ----- 
From: "Daniel Fundo" <fundo@bellsouth.net>
To: <clnoble@email.arizona.edu>
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............<<G>> 
> The only difference between steel and aluminum in the calculations is
> the "E" factor, the modulus of elasticity.
> 
> *****-----
> Dan F.
> Secretary/MAS
> Memphis, TN