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

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

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Concrete Technology and Design of Concrete Structures
According to IS : 456-1978, the fiexural strength of concrete is

directly proportional to square root of compressive strength
inversely proportional to square root of compressive strength
inversely proportional to compressive strength
directly proportional to compressive strength

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