RCC Structures Design
As the percentage of steel increases

Lever arm decreases
Depth of neutral axis decreases
Lever arm increases
Depth of neutral axis increases

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RCC Structures Design
Steel beam theory is used for

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

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