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

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

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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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