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 0.2% 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 2% proof stress,
has a definite yield point

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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 one fourth of diameter of main bar
More than or equal to 5 mm

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Concrete Technology and Design of Concrete Structures
Due to circumferential action of the spiral in a spirally reinforced column

Ductility of column reduces
Both the capacity of column and ductility of column increase
Capacity of column is decreased but ductility of column increases
Capacity of column is decreased

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