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RE: Steel SMRF beam connection

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We used to do this when I was designing a lot of SMFs, but only as an extension on a multi-bay line of frames—never as a one-sided half bay frame.  I’ve analyzed a lot of those multi-bay with a half-bay on the end, and I can tell you you get very little (if any) capacity out of such a frame. The only reason I would ever leave them in a design is if I had a cantilever where I was using a full bay as the backspan or if I needed a little nudge to make redundancy work under CBC.


Shaun Dustin, MS, PE

Doctoral Candidate

USTAR Biofuels Initiative

Utah State University
4130 Old Main Hill
Logan, UT 84322




From: OSCAR HENRIQUEZ [mailto:OHENRIQUEZ(--nospam--at)]
Sent: Wednesday, November 21, 2007 5:46 PM
To: seaint(--nospam--at)
Subject: Steel SMRF beam connection



Can someone tell me if it is allowed, as part of a steel Special Moment Resisting Frame (SMRF) system, to have a beam with a pre-qualified RBS moment connection at one end of the beam and a simple shear connection at the other end of the beam?  Without getting into details of why we are doing this, I would like to know if having such connections will disqualify the frame from being a SMRF.  If this is not allowed, where is this stated in the CBC or Specifications?


Happy Thanksgiving everyone!



Oscar Henriquez, P.E.

McLean & Schultz

Brea, CA 92801