RCC Structures Design
A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n?. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is

bn (fc/2) (d - n/3)
½ n₁ (1 - n₁/3) cbd²
Atft (d - n/3)
All listed here

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RCC Structures Design
If the depth of actual neutral axis of a doubly reinforced beam

All listed here
Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously
Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier
Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier

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