RCC Structures Design
Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by

Grashoff formula
Rankine Grashoff formula
Rankine formula
Marcus formula

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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
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

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RCC Structures Design
A pre-stressed concrete member is preferred because

Removal of cracks in the members due to shrinkage
Its dimensions are not decided from the diagonal tensile stress
All listed here
Large size of long beams carrying large shear force need not be adopted

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