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RCC Structures Design

RCC Structures Design
If the sides of a slab simply supported on edges and spanning in two directions are equal, the maximum bending moment is multiplied by

0.7
0.5
0.6
0.4

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RCC Structures Design
Lapped splices in tensile reinforcement are generally not used for bars of size larger than

30 mm diameter
36 mm diameter
18 mm diameter
24 mm diameter

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RCC Structures Design
Total pressure on the vertical face of a retaining wall of height ‘h’ per unit run exerted by the retained earth weighing ‘w’ per unit volume, is

wh² [(1 - sin φ)/2(1 + sin φ)]
wh² [(1 - sin φ)/(1 + sin φ)]
wh² [(1 - sin φ)/3(1 + sin φ)]
wh [(1 - sin φ)/(1 + sin φ)]

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RCC Structures Design
The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30° and 2000 kg respectively, the effective width of the stem at the bottom, is

51.5
54.5
52.5
53.5

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RCC Structures Design
With usual notations the depth of the neutral axis of a balanced section, is given by

t/mc = (d + n)/n
mc/t = (d - n)/n
t/mc = (d - n)/n
mc/t = n/(d - n)

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

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