RCC Structures Design
The toe projection of foundation slabs is taken

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

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RCC Structures Design
Steel beam theory is used for

Design of simple steel beams
Doubly reinforced beams ignoring compressive stress in concrete
Steel beams encased in concrete
Beams if shear exceeds 4 times allowable shear stress

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