Concrete Technology and Design of Concrete Structures
In prestressed concrete

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
forces of tension and compressions remain unchanged but lever arm changes with the moment

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

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

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