RCC Structures Design
If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is

[(m + r)/m] d
[(r - m)/m] d
[m/(m + r)] d
[m/(m - r)] d

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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
Steel beams encased in concrete
Doubly reinforced beams ignoring compressive stress in concrete

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