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RCC Structures Design

RCC Structures Design
For M 150 grade concrete (1 : 2 : 4) the moment of resistance factor is

0.87
7.5
5.8
8.5

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RCC Structures Design
Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than

One diameter of thicker bar
One diameter of thinner bar
None of these
Twice the diameter of thinner bar

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

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RCC Structures Design
If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is

D = W (a - b)/4a²bq
D = W (a² - b²)/8a²bq
D = W (a² - b²)/4a²bq
D = W (a² - b²)/4abq

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RCC Structures Design
If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm² and 1400 kg/cm² respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is

0.496 %
0.596 %
0.696 %
0.796 %

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RCC Structures Design
A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm² steel. If the modular ratio (m) is 15, the depth of the neutral axis, is

35 cm
20 cm
30 cm
25 cm

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