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RCC Structures Design

RCC Structures Design
The maximum diameter of a bar used in a ribbed slab, is

20 mm
6 mm
22 mm
12 mm

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RCC Structures Design
If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and σc are the modular ratio and maximum stress in the configuration of concrete, the strength of column is

σcAc + m σcAsc
σc(A - Asc) + m σcAsc
σc[A + (m - 1)Asc]
All listed here

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RCC Structures Design
If T and R are tread and rise respectively of a stair, then

2R + T = 60
2R + T = 30
R + 2T = 60
R + 2T= 30

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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
35
30

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RCC Structures Design
An R.C.C. roof slab is designed as a two way slab if

The slab is discontinuous at edges
It supports live loads in both directions
The ratio of spans in two directions is less than 2
The slab is continuous over two supports

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

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