RCC Structures Design
The toe projection of foundation slabs is taken

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

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RCC Structures Design
For a ribbed slab

Overall depth of the slab shall not exceed four times the breadth of the rib
Clear spacing between ribs shall not be greater than 4.5 cm
Width of the rib shall not be less than 7.5 cm
All listed here

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