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

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

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RCC Structures Design
As per IS : 456, the reinforcement in a column should not be less than

0.6% and not more than 6% of cross-sectional area
0.7% and not more than 7% of cross-sectional area
0.8% and not more than 8% of cross-sectional area
0.5% and not more than 5% of cross-sectional area

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