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RCC Structures Design

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

10 %
50 %
20 %
40 %

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RCC Structures Design
If l₁ and l₂ are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w₁ and w₂ acting on strips parallel to l₂ and l₁ is

w₁/w₂ = l₂/l₁
w₁/w₂ = (l₂/l₁)³
w₁/w₂ = (l₂/l₁)⁴
w₁/w₂ = (l₂/l₁)²

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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

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

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RCC Structures Design
If the maximum shear stress at the end of a simply supported R.C.C. beam of 16 m effective span is 10 kg/cm², the length of the beam having nominal reinforcement, is

8 cm
10 cm
12 cm
6 cm

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RCC Structures Design
A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is

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

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RCC Structures Design
As per IS : 1343, total shrinkage for a pre-tensioned beam, is

3.0 × 10⁻⁵
3.0 × 10⁻³
3.5 × 10⁻⁵
3.0 × 10⁻²

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