RCC Structures Design
The maximum shear stress (q) in concrete of a reinforced cement concrete beam is

Width/(Lever arm × Shear force)
Lever arm/(Shear force × Width)
Shear force/(Lever arm × Width)
(Shear force × Width)/Lever arm

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RCC Structures Design
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

42 diameters from the outer edge of the column
42 diameters from the centre of the column
24 diameters from the centre of the column
42 diameters from the inner edge of the column

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