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UFM (Beam reaction distribution - gusset above and below)

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MGaMart

Structural
Aug 23, 2016
50
Just wondering if anyone else has thought about this. I have a similar connection detail to the one shown in Figure A-4 (in Appendix A) of the AISC Design Guide 29 (an extended shear tab brace connection), however there is a gusset above and below the floor beam. If I were to incorporate the beam reaction into both gussets, is it possible to NOT have any horizontal force H_bcR as part of the beam-to-column connection detail? The force couple due to the beam reaction eccentricity moment (=R*ec) could be defined as the distance from the upper gusset centroid to the lower gusset centroid (= beta_top + depth of beam + beta_btm). In this way, the extended shear tab would need to account for H_cR and the internal moment, but would not need to be incorporated into the beam-to-column bolted connection. I believe this is still an admissible force distribution since the the vertical and horizontal forces due to the beam reaction in the gussets are still accounted for in the beam-to-gusset connections (superimposed onto the forces derived from the usual UFM distribution). I'd just like some confirmation that I'm not overlooking anything in this approach. I don't believe it matters, but both braces are active (one is subject to compression, the other -tension). I'm somewhat new to using UFM, most of the examples I see are for a single gusset and don't give much direction when there is a brace above and below the floor beam under consideration.
 
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