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RCC Structures Design

RCC Structures Design
Cantilever retaining walls can safely be used for a height not more than

3 m
4 m
5 m
6 m

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RCC Structures Design
The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called

Balanced section
Economic section
All listed here
Critical section

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RCC Structures Design
The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or

24 bar diameters
30 bar diameters
18 bar diameters
12 bar diameters

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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

0.596 %
0.796 %
0.496 %
0.696 %

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RCC Structures Design
If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge

Is decreased by Pe/Z
Is increased by PZ/e
Remains unchanged
Is increased by Pe/Z

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RCC Structures Design
An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 meters and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is

7.6 kg/cm²
8.3 kg/cm²
21.5 kg/cm²
21.5 kg/cm²

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