RCC Structures Design
A part of the slab may be considered as the flange of the T-beam if

It is effectively bonded together with the beam
It is built integrally with the beam
Flange has adequate reinforcement transverse to beam
All of the listed here

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

0.5% and not more than 5% of cross-sectional area
0.8% and not more than 8% 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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