RCC Structures Design
The width of the flange of a L-beam, should be less than

Least of the above
Breadth of the rib + four times thickness of the slab
Breadth of the rib + half clear distance between ribs
One-sixth of the effective span

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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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