Concrete Technology and Design of Concrete Structures
The diameter of ties in a column should be

More than 5 mm and also more than one-fourth of diameter of main bar
More than 5 mm but less than one-fourth of diameter of main bar
More than or equal to 5 mm
More than or equal to one fourth of diameter of main bar

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Concrete Technology and Design of Concrete Structures
Minimum pitch of transverse reinforcement in a column is

forty-eight times the diameter of transverse reinforcement
the least lateral dimension of the member
lesser of the above three values
sixteen times the smallest diameter of longitudinal reinforcement bar to be tied

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