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RCC Structures Design

RCC Structures Design
The breadth of a ribbed slab containing two bars must be between

10 cm to 12 cm
12 cm to 15 cm
8 cm to 10 cm
6 cm to 7.5 cm

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RCC Structures Design
A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is

45
40
30
35

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RCC Structures Design
The load stress of a section can be reduced by

Replacing larger bars by greater number of small bars
Replacing smaller bars by greater number of greater bars
Increasing the total perimeter of bars
Decreasing the lever arm

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RCC Structures Design
Post tensioning system

None of these
Was widely used in earlier days
Is economical for large spans and is adopted now a days
Is not economical and hence not generally used

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

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RCC Structures Design
If the bearing capacity of soil is 10 tonnes/cm² and the projection of plain concrete footing from walls, is a cm, the depth D of footing is

D = 0.0775 a
D = 0.775 √a
D = 0.775 a
D = 0.775 a²

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