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RCC Structures Design

RCC Structures Design
The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of

25 mm
15 mm
20 mm
10 mm

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RCC Structures Design
In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as

A key
A cut-off wall
A rib
All listed here

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RCC Structures Design
The load stress of a section can be reduced by

Increasing the total perimeter of bars
Replacing smaller bars by greater number of greater bars
Decreasing the lever arm
Replacing larger bars by greater number of small bars

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

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

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RCC Structures Design
If ‘A’ is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force ‘P’ through its centroidal longitudinal axis, the compressive stress in concrete, is

P/A
A/P
P/2A
2A/P

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RCC Structures Design
If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is

w (R + T)/T
w √(R² + T²)/T
w √(R + T)/T
w (R/T)

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