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RCC Structures Design

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
75 cm
20 cm
40 cm

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RCC Structures Design
The advantage of reinforced concrete, is due to

Monolithic character
All listed here
Fire-resisting and durability
Economy because of less maintenance cost

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RCC Structures Design
If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)

√(M/Q)
M/10√Q
M/100Q
√(M/100Q)

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RCC Structures Design
According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is

5 kg/cm²
10 kg/cm²
20 kg/cm²
15 kg/cm²

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

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RCC Structures Design
The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than

18 bar diameters
36 bar diameters
24 bar diameters
30 bar diameters

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