RCC Structures Design
The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or

12 bar diameters
30 bar diameters
24 bar diameters
18 bar diameters

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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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