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RCC Structures Design

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

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

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RCC Structures Design
Long and short spans of a two way slab are ly and lx and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. According to Rankine Grashoff theory

(wx/wy) = (ly/lx)²
None of these
(wx/wy) = (ly/lx)
(wx/wy) = (ly/lx)⁴

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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 Pe/Z
Remains unchanged
Is increased by PZ/e

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RCC Structures Design
If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least

WL/P
WL/3P
WL/2P
WL/4P

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RCC Structures Design
The live load to be considered for an accessible roof, is

75 kg/m³
200 kg/cm²
150 kg/m²
Nil

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RCC Structures Design
A flat slab is supported

On columns monolithically built with slab
On beams
On columns
On beams and columns

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