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RCC Structures Design

RCC Structures Design
The minimum cube strength of concrete used for a pre-stressed member, is

350 kg/cm²
50 kg/cm²
150 kg/cm²
250 kg/cm²

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RCC Structures Design
If P kg/m² is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by

D = 0.775 Pa
D = 0.07775 aP
D = 0.0775 aP
D = 0.00775 aP

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

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RCC Structures Design
If ‘W’ is weight of a retaining wall and ‘P’ is the horizontal earth pressure, the factor of safety against sliding, is

2.0
3.0
1.5
1.0

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RCC Structures Design
If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

Square
Trapezoidal
Triangular
Rectangular

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RCC Structures Design
High strength concrete is used in pre-stressed member

To provide high bond stresses
To overcome high bearing stresses developed at the ends
All listed here
To overcome bursting stresses at the ends

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