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

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

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

forces of tension and compressions remain unchanged but lever arm changes with the moment
both forces of tension and compres-sion as well as lever arm change
both forces of tension and compres-sion as well as lever arm remain unchanged
forces of tension and compression change but lever arm remains unchanged

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