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

does not show definite yield point but yield point is defined by 0.1% proof stress
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 0.2% proof stress

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

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

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