RCC Structures Design
Steel beam theory is used for

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

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RCC Structures Design
If the shear stress in a R.C.C. beam is

Greater than 20 kg/cm², the size of the section is changed
Greater than 4 kg/cm², but less than 20 kg/cm², shear reinforcement is provided
All of these
Equal or less than 5 kg/cm², no shear reinforcement is provided

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