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RCC Structures Design

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

10
15
25
20

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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

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

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

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RCC Structures Design
If permissible working stresses in steel and concrete are respectively 1400 kg/cm² and 80 kg/cm² and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is

38 cm
39 cm
40 cm
37 cm

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RCC Structures Design
Minimum spacing between horizontal parallel reinforcement of the same size should not be less than

2.5 diameters
3 diameters
3.5 diameters
One diameter

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RCC Structures Design
If the diameter of longitudinal bars of a square column is 16 mm, the diameter of lateral ties should not be less than

7 mm
6 mm
4 mm
5 mm

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