Composite Metal Deck

[XR250]

When checking deflection in a shored composite slab (after shoring is removed), Do I use “Id” and E for steel or E for concrete? (I assume E-steel as the numbers don’t seem to make sense otherwise). For long-term deflection, multiply DL deflection x 3?
Also, this is going on an exterior terrace with flagstone on top. It is a 3-span condition. The arch. is very concerned about cracking. We are around L/d = 25 and will check vibration. I was thinking to add negative reinforcement over the beams as required. However, what about putting a caulked joint in the slab and flagstone over each beam to keep the areas smaller? We could also do 2 pours to get the same effect. It will have a roof but no walls. Money is not really an issue here.

 

[TRAK.Structural]

I've done top bars over girders a lot in commercial type buildings, but not over the beams.

For construction joints, what I've seen is the joint placed at 1/3 points when perpendicular to the beams, or centered between beams when the joint is parallel to the beams. In either case, usually some #3 bars x 36" long centered through the joint