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Re: Aluminum

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>30,000 psi  Design of machine elements - 5th Ed. M.F. Spotts.
Not even close. AA allowables for shear in webs for building design is 12 
ksi. Tensile allowable is on 19 ksi. For welded structures these numbers 
go to 7.5 ksi and and 11 ksi. Values are lower for bridge type 
structures. Shearing yield and ultimate stress are 20 ksi and 27 ksi. Get 
hold of 'Specifications for Aluminum Structures,' from the Aluminum 
Association quick. 

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)