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RE: Design of knee braced steel frame for support of a crane on a trolley

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Dear Ben Yousefi:

I think your reply is in error.  The categorization of a structural system 
should be based on its expected behavior, including its yield mechanisms. 
 No doubt the braces in the knee-braced frame will resist axial load, but 
the yield mechanism will almost certainly be flexure of the beams or 
columns.  If the designer treats this system as an OCBF he or she will 
perform pointless checks on compactness and slenderness of the knee braces, 
but will not pay attention to compactness of the flexural members nor to 
their lateral stability.

Respectfully,

Rafael Sabelli


ORIGINAL MESSAGE:
From: "Yousefi, Ben" <Ben.Yousefi(--nospam--at)ci.sj.ca.us>
To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: RE: Design of knee braced steel frame for support of a crane on a

I would treat it as a K brace per section 2213.8.4.2 along with the
requirements for Nonconcentric brace per 2213.8.4.3.