Concrete Technology and Design of Concrete Structures
Critical section for shear in case of flat slabs is at a distance of

effective depth of slab from periphery of column/drop panel
at the drop panel of slab
d/2 from periphery of column/capital/ drop panel
at the periphery of column

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Concrete Technology and Design of Concrete Structures
If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

depends on aCbC only
is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.
depends on as, only
depends on both crst and acbc

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