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steel PL over RC slab

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the previous respondents all had good advice.  If
you're dealing with a uniform load or a line load
across the ribs, it's pretty much as Roger says.  Your
problem has two further degrees of complexity.  First,
you've got a point load (just one wheel?)  Second, the
concrete slab doesn't have the same properties in both

So, it depends on how accurate you want your solution
to be.  You could probably model this pretty well in a
package like RISA.  You might have to play games with
the ribbed slab, but you could get close.

A further level of complexity and accuracy involves
dealing with the fact that the steel plate will lift
off the slab at places.  I suppose this could be done
by connecting them with compression-only connectors.

Alternatively, if you don't have the time for this,
pick the plate up off the slab, as someone suggested. 
That will work without question.

Mike Hemstad
St. Paul, Minnesota 

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