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Single Plate Connection of Collectors Procedure

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I have an analysis problem that must be fairly common.

I am analyzing some existing connections of W18 and larger collectors into 
columns.  They are one-sided plate connections with connection plate held by 
stiffeners on top and bottom similar to Fig. 10-25 on page 10-158 and Fig. 
10-28 on page 10-159 of the 3rd ed AISC LRFD manual.  The difference is that 
with my connections, there would be a large axial load in the beams as well 
as gravity loads.  

The design would need to take into account beam-end rotation like Table X in 
the old ASD 9th ed, but also account for the axial loads.  In addition, the 
governing limit state must be ductile because I am in Seismic Zone 4.  

I haven't seen a design procedure that address this situation.  I would 
appreciate any Ideas on procedures or approaches 

Mark Johnson PE

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