RCC Structures Design
The toe projection of foundation slabs is taken

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

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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

Two-third of the width of the slab
Half 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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