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RE: design code

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>	The rigidity referred to in Section 2227 refers to connection
>rigidity consistent with your frame analysis.
Part of this problem is making sure that your connection can withstand 
any relative motion. If you assume pinned connections, the connection 
needs to accommodate relative rotation. That's no problem if the 
connection actually is pinned with a single pin, but if you take 'pinned' 
to mean 'fairly soft in rotation' the relative displacements during 
rotation may be enough to tear things apart. This happens with fillet 
welds, especially if the weld doesn't have all the ductility that the 
engineer imagines.

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