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RCC Structures Design

RCC Structures Design
If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is

14 mm
10 mm
12 mm
16 mm

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RCC Structures Design
If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least

WL/2P
WL/3P
WL/P
WL/4P

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RCC Structures Design
If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge

Is decreased by Pe/Z
Is increased by PZ/e
Remains unchanged
Is increased by Pe/Z

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RCC Structures Design
By over-reinforcing a beam, the moment of resistance can be increased not more than

25 %
10 %
20 %
15 %

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RCC Structures Design
A raft foundation is provided if its area exceeds the plan area of the building by

10 %
20 %
40 %
50 %

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RCC Structures Design
The minimum number of main steel bars provided in R.C.C.

Rectangular columns is 4
Circular columns is 6
Octagonal columns is 8
All listed here

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