To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: RE: Built-up Columns
From: Charlie Carter <carter(--nospam--at)aiscmail.com>
Date: Mon, 10 May 1999 16:03:57 -0500
Unless I misunderstand your question, it sounds like you are proposing to
use the AISC Specification provisions, which are predicated upon the 3/4
relationship being satisfied, even though it isn't. The intent in the
Specification, as I understand it, is to wind up with a built-up member
that actual behaves as a built-up member. So the further away from the 3/4
relationship you get, the further you are getting away from having
something you can call a built-up member. Sorry for all the semi-circular
reasoning in this.
From: Chanel1096(--nospam--at)aol.com [SMTP:Chanel1096(--nospam--at)aol.com]
Sent: Monday, May 10, 1999 9:09 AM
Subject: Built-up Columns
My question concerns columns built-up out of two steel shapes.
AISC-ASD Section E4 states that the spacing between connections for the
members shall be such that their individual l/r ratios do not exceed 3/4
governing ratio of the built-up member as a whole.
Now to my question, what if you space the connections for the
individual members such that the l/r are greater then the actual kl/r of
built-up member but you then base the strength of the built-up member so
the allowable load is based on a kl/r where the 3/4 relationship is not
violated? Any Comments or insights?
-Bill King, EIT