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

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

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Concrete Technology and Design of Concrete Structures
Due to circumferential action of the spiral in a spirally reinforced column

Both the capacity of column and ductility of column increase
Capacity of column is decreased
Capacity of column is decreased but ductility of column increases
Ductility of column reduces

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