RCC Structures Design
If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

K/x (1 + x/d) + bw
All listed here
Kx (1 + x/l) + bw
Kx (1 - x/l) + bw

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

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