Concrete Technology and Design of Concrete Structures
Stress strain curve of high tensile steel

has a definite yield point
does not show definite yield point but yield point is defined by 2% proof stress,
does not show definite yield point but yield point is defined by 0.1% proof stress
does not show definite yield point but yield point is defined by 0.2% proof stress

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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
lesser of the above three values
forty-eight times the diameter of transverse reinforcement

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