@phamENG Unless I'm mistaken, I think OP means to support the kickers, not generally use the concrete as a diaphragm. If I'm wrong about that, I'll modify my answer, because there's a way to do it.
@Structintern3 Depends if the kickers are going into the underside or top side.
Top side connection: Since 4" is a lot, if the forces are compression+shear only, you can probably fasten directly into the slab and not worry about fastening to the T&G sheathing. If it's tension/compression+shear, you're better off fastening into the T&G diaphragm. As for capacity, I don't know about T&G specifically but NDS has tables for allowable load capacity in psf for thick plywood, and I'd assume it's similar. If you have a linear load, you can probably just extrapolate to psf. If it's concentrated loads, I'd use a plate to spread the load and connect directly to joists. The plate would be invisible because it's covered by the 4" concrete. The plate would also have a tangential benefit of being a kind of shear key to laterally tie the concrete and T&G together in that area.
Bottom of T&G connection: Why not run a horizontal plate/beam and connect directly to joists? Then you don't have to worry about the diaphragm vertical flexure capacity.
