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RCC Structures Design

RCC Structures Design
The number of treads in a flight is equal to

Risers in the flight
Risers minus one
None of these
Risers plus one

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

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RCC Structures Design
If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be

8hp/l²
8hp/l
8hl/p
8hl/p²

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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

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

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RCC Structures Design
The design of heel slab of a retaining wall is based on the maximum bending moment due to:

Its own weight
Weight of the soil above it
Load of the surcharge, if any
All listed here

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RCC Structures Design
As per IS : 1343, total shrinkage for a pre-tensioned beam, is

3.0 × 10⁻³
3.5 × 10⁻⁵
3.0 × 10⁻⁵
3.0 × 10⁻²

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