CSD-
I sketched it out very quickly and what seems to result is:
Compression in the top flanges due to moment result in a vertically upward shear force
Tension in the bottom flanges due to moment result in a vertically downward shear force.
These two would combine to put the web of the beam at the join in tension, right?
The shear forces on the beam would want to put the same point in compression, correct?