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Re: Steel SMRF beam connection

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Check with your building official if they'll take anything bigger than
a W14 frame column in a moment frame. For SMRF's you can't unless you
have a test data or can reference a previous test performed by someone
else.

-gm

On Nov 25, 2007 12:40 PM, Jeff Smith <jeffsmith7(--nospam--at)comcast.net> wrote:
>
>
> I am considering a similar situation right now. One end of a single bay, one
> story frame does not have room for the same size column because it is
> between a repetitive window system. All that will fit on one end is a 6x6
> tube or wide flange column. A 24" WF column will fit in the other end. I
> can't meet the drift requirements unless the base of the 24" column is
> fixed. (I am using OMF) If I do this, is it now a cantilever column even
> though there is a moment connection at the top of the 24" column to the
> beam? And if so then we have the R in one direction conundrum. We are
> squeezing this in under the 98 Calif Building Code.
>
> Jeff
>
>
>  ________________________________
>  From: Shaun Dustin [mailto:sdustin(--nospam--at)cc.usu.edu]
> Sent: Saturday, November 24, 2007 9:34 PM
> To: seaint(--nospam--at)seaint.org
> Subject: RE: Steel SMRF beam connection
>
>
>
>
>
>
> Oscar,
>
>
>
> 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
>
> sdustin(--nospam--at)cc.usu.edu
>
> 435-770-7816
>
>
>
>  ________________________________
>
>
> From: OSCAR HENRIQUEZ [mailto:OHENRIQUEZ(--nospam--at)ms-ae.com]
> Sent: Wednesday, November 21, 2007 5:46 PM
> To: seaint(--nospam--at)seaint.org
> 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
>
>



-- 
-gm

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