I just saw your drawing and youll have brackets where the 2 joists meet,you need to reinforce that one ibeam that the other ibeams are attached to because that one joist is bearing the weight of all the others conected to it..you follow? bolt a 2x8 into the groove of the ibeam on both sides including between the joists and your probelm is solved about 60$in materials,150ish if you remove drywall. The piece of mind is worth it
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