RCC Structures Design
‘P’ is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The maximum stress ‘f’ in the beam, subjected to a maximum bending moment ‘M’, is

f = (P/'+ (Z/M)
f = (P/A) + (M/6Z)
f = (P/A) + (M/Z)
f = (A/P) + (M/Z)

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RCC Structures Design
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

42 diameters from the inner edge of the column
24 diameters from the centre of the column
42 diameters from the outer edge of the column
42 diameters from the centre of the column

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