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RCC Structures Design

RCC Structures Design
If the average bending stress is 6 kg/cm² for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is

38 d
58 d
28 d
48 d

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RCC Structures Design
If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

WL/10 (L + 2D/3)²
WL/10 (L - 2D/3)²
WL/12 (L - D/3)²
WL/12 (L - 2D/3)²

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

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RCC Structures Design
Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads, it is taken as

1/12th of the span
1/16th of the span
1/10th of the span
1/8th of the span

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RCC Structures Design
The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm², safe shear stress 5 kg/cm² and B.M. 24 mt,

Is safe in shear
Needs redesigning
Is over safe in shear
Is unsafe in shear

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RCC Structures Design
For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed

25
15
20
10

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