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RCC Structures Design

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

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

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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

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

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RCC Structures Design
A very comfortable type of stairs is

Open newel
Dog legged
Geometrical
Straight

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RCC Structures Design
If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:

(1 - C) mf - eE
(C - 1) mf - eE
(C - 1) mf + eE
(1 - C) mf + eE

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RCC Structures Design
The width of the rib of a T-beam, is generally kept between

1/3 to 2/3 of rib depth
1/3 to 1/2 of rib depth
1/2 to 3/4 of rib depth
1/7 to 1/3 of rib depth

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RCC Structures Design
If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is

WR²/16
Zero
2WR²/16
3WR²/16

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