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RCC Structures Design

RCC Structures Design
The steel generally used in R.C.C. work, is

High carbon steel
Mild steel
Stainless
High tension steel

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RCC Structures Design
As the percentage of steel increases

Depth of neutral axis decreases
Lever arm decreases
Lever arm increases
Depth of neutral axis increases

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RCC Structures Design
If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by

(5/6) (r²/1 + r⁴) M
(5/6) (r²/1 + r²) M
(5/6) (r/1 + r²) M
(5/6) (r²/1 + r³) M

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

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RCC Structures Design
According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than

30 cm
40 cm
20 cm
75 cm

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RCC Structures Design
The maximum shear stress (qmax) in a rectangular beam is

1.75 times the average
1.25 times the average
2.0 times the average
1.50 times the average

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