To: "SEAOC Newsletter" <seaint(--nospam--at)seaint.org>
Subject: RE: design code
From: Christopher Wright <chrisw(--nospam--at)skypoint.com>
Date: Mon, 3 May 99 12:25:47 -0500
> 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
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)