You may wish to read this paper in Engineering Journal '99:
http://www.ce.berkeley.edu/~boza/courses/cee248/literature/AISC_EJ_Drake-Elkin.pdf
The case D described in the paper deals with both uplift force and moment.
As far as I understand, the problem is not with principal scheme of
the joint but with defining loads on anchor bolts/foundation. I think
you could do an analysis with only the moment applied, and then
distribute the axial tension among the bolts.
Regards,
--
Alexander Bausk
CAD manager, Structural engineer at
Nuclear Engineering&Research Lab
Dnipropetrovsk, Ukraine
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