RCC Structures Design
If d is the diameter of a bar, ft is allowable tensile stress and fb, is allowable bond stress, the bond length is given by

ft .d/4fb
(π/4). (ft .d/fb)
(π/4). (ft .d3/fb)
π ft .d²/fb

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

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

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