RCC Structures Design
In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as

A key
All listed here
A rib
A cut-off wall

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RCC Structures Design
For a ribbed slab

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

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