RCC Structures Design
The diameter of the column head support a flat slab, is generally kept

0.25 times the diameter of the column
0.25 times the span length
4.0 cm larger than the diameter of the column
5.0 cm larger than the diameter of the column

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RCC Structures Design
A pre-stressed concrete member is preferred because

Removal of cracks in the members due to shrinkage
All listed here
Its dimensions are not decided from the diagonal tensile stress
Large size of long beams carrying large shear force need not be adopted

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