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Re: aluminum HSS connection design

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On Apr 13, 2005, at 11:49 AM, Gale45man wrote:

If there are no such guides or manuals, what do folks
think about using the AWS D1.1 equations for steel
I'd be real careful about this--your best bet is to go into the ASCE archives and see what you can find. The first problem with aluminum is that the allowable stress for weldments goes way down becasue aluminum invariably loses its temper to varying degrees depending on the alloy and the weld metal. Aluminum is very sensitive to fatigue failures for a couple of reasons: it accumulates plastic strain faster because of the lower modulus and it's not as forgiving of cracks and stress concentrations as steel.

I did an investigation a while back of some aluminum compactors which were tearing themselves apart under service loading. The compactors apparently were copied from similar steel structures but after a few load cycles (and some wretched attempts at repairs) they had cracked all to hell.

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

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