is the shear force capacity in a joist seat greater than the
 

is the shear force capacity in a joist seat greater than the
kcs joist tables post a value for the maximum shear capacity for that joist. is this the max load the joist seat can take? if not, is there a smart way of determining the extra compressive force that the seat angles can take? this question is in regard to a standard 2 1/2" seat depth. the system is in place so i do not have the option of specifying a design value for the manufacturer.
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are you retrofitting joists?
i would assume the maximum bearing capacity is the same as the maximum reaction from the shear force or the moment and reinforce as necessary. with long joists the manufacturer may have designed the joist seat for the reaction from either the moment or the shear, which ever controlled the design. the maximum reaction for the moment would be smaller than that from shear for long spans. basically it's a "don't try to skrimp" approach. conservative is good when checking joists. they don't tend to have a lot of reserve.