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

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

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Concrete Technology and Design of Concrete Structures
If the foundations of all the columns of a structure are designed on the total live and dead load basis, then

there will be no differential settlement
there will be no settlement of columns
the settlement of interior columns will be more than exterior columns
the settlement of exterior columns will be more than interior columns

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