Reinforcing Required for an elevated platform on top of a concrete slab on grade 1

[bohnerjo]

I am working on a project where a two narrow concrete slabs are to be cast in place on top of a slab on grade to allow vehicles to be inspected from underneath. I have attached a sketch to clarify the design concept. I am unsure how to determine the reinforcing that is required.

 

[JedClampett]

Minimum reinforcing each direction, say .002 (.2%) reinforcing ratio.

 

[hokie66]

Depends on if you want to control cracks. If you do, you would need more longitudinal reinforcement, because the existing slab will restrain the new slab.

 

[BUGGAR]

170 is not much for inspecting the underside of vehicles. They're not going to put a pit here are they?