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

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

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RCC Structures Design
Steel beam theory is used for

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

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