RCC Structures Design
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

Half of the width of the slab
Two-third of the width of the slab
Four-fifth of the width of the slab
Three-fourth of the width of the slab

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

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