Very interesting tech. report about the behaviour of r.c flat slab and its treatment in British standards and codes of practices also the method of determining moment transfer to the column from the slab and shear influence on the slab punching shear capacity resulting from this moment and shear interaction, were considered to be the main subjects requiring investigation.
Code
Behavior of Reinforced Concrete Flat Slabshttp://xa.yimg.com/kq/groups/23711357/1566180663/name/Behaviour_Of_Reinforced_Concrete_Flat_Slabs.pdf
