RCC Structures Design
The toe projection of foundation slabs is taken

Equal to heel slab
As one third of the base
Below ground surface
As one sixth of overall height of the wall

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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

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

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