RCC Structures Design
The toe projection of foundation slabs is taken

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

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RCC Structures Design
Steel beam theory is used for

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

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