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SCBF Uniform Force Method

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Dear Mr. Sidler:
There is information on design of gusset plates for SCBF in the following Steel TIPS that I hope you will find helpful.

Astaneh-Asl, A., Cochran, M and Sabelli, R. (2006) "Seismic Detailing of Gusset Plates for Special Concentrically Braced Frames", Steel Technical and Product Information (Steel TIPS) report, Structural Steel Educational Council (, Moraga , Ca.

A PDF copy can be downloaded from (free for California and Nevada registrants and a for nominal fee for others). If you have any problem in using the site, please contact Mr. Fred Boettler, Executive Director of SSEC at ssec_2000(--nospam--at) We, the authors, have tried to put all the information we could in this Steel TIPS to help structural engineers to design and proportion the gusset plates for SCBF. Specially, the Steel TIPS is geared towards cases where the brace buckles out of plane of the frame ( the same as the plane of gusset plate) and you need to accommodate formation of a plastic hinge in the gusset plate by providing a "2t" free length in the gusset beyond the end of the brace member (please see section 13.3b of the ANSI/AISC-341-05, Seismic Provisions for Structural Steel Buildings, for further info on "2t".
A spreadsheet of the equations and methodology given in the above Steel TIPS is also available for purchase at the site for Engineering and Publishing Services.

If you have any question on the above Steel TIPS , please do not hesitate to ask. All three of us authors of the above Steel TIPS on SCBFs are SEAINT list users and as we have done in the past at least one of us will try to help clarify/answer your question on our publication.

Abolhassan Astaneh-Asl, Ph.D., P.E.
Professor and Consultant on Structural Engineering, Earthquake Engineering and Protection of Building and Bridges against Blast and Impact

From: Andre Sidler <asidler(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: SCBF Uniform Force Method

Listers -

Anyone interested in helping me understand how to apply the uniform force method to a SCBF connection using a beam stub coming off the column similar =
to Example 3.11 of the AISC Seismic Design Manual.  How my problem differs from the example is that I do not have a brace coming in at the top of the beam, just a brace coming off the bottom.  I have tried several times to determine the gusset plate connection forces but every iteration I try my moments never sum up to zero (or close to zero).  Anyone interested please use the member sizes and forces from the AISC Seismic Design Manual Example 3.11.


Andre J. Sidler, S.E.
Quantum Consulting Engineers
Seattle, WA


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