RCC Structures Design
An R.C.C. roof slab is designed as a two way slab if

The ratio of spans in two directions is less than 2
It supports live loads in both directions
The slab is continuous over two supports
The slab is discontinuous at edges

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RCC Structures Design
Steel beam theory is used for

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

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