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RCC Structures Design

RCC Structures Design
The steel generally used in R.C.C. work, is

Stainless
High tension steel
Mild steel
High carbon steel

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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
10
20

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RCC Structures Design
As per I.S. 456 - 1978, the pH value of water shall be

Equal to 6
Less than 6
Not less than 6
Equal to 7

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RCC Structures Design
In a doubly-reinforced beam if ‘c’ and ‘t’ are stresses in concrete and tension reinforcement, ‘d’ is the effective depth and ‘n’ is depth of critical neutral axis, the following relationship holds good

mc/t = n/(d - n)
mc/t = (d - n)/t
(m + c)/t = n/(d + n)
(t + c)/n = (d + n)/n

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RCC Structures Design
If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is

[m/(m - r)] d
[m/(m + r)] d
[(m + r)/m] d
[(r - m)/m] d

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RCC Structures Design
If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

K/x (1 + x/d) + bw
Kx (1 + x/l) + bw
All listed here
Kx (1 - x/l) + bw

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