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RCC Structures Design

RCC Structures Design
The maximum area of tension reinforcement in beams shall not exceed

0.15 %
1
6
4 %

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RCC Structures Design
The ratio of the breadth to effective depth of a beam is kept

0.5
0.75
0.7
0.25

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RCC Structures Design
If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width

T - R
√(R² + T²)
R - T
R + T

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RCC Structures Design
If l₁ and l₂ are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w₁ and w₂ acting on strips parallel to l₂ and l₁ is

w₁/w₂ = l₂/l₁
w₁/w₂ = (l₂/l₁)³
w₁/w₂ = (l₂/l₁)²
w₁/w₂ = (l₂/l₁)⁴

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RCC Structures Design
‘P’ is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The minimum stress ‘f’ on the beam subjected to a maximum bending moment ‘M’ is

f = (P/A) - (M/Z)
f = (P/'- (Z/M)
f = (P/A) - (M/6Z)
f = (A/P) - (M/Z)

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RCC Structures Design
The modular ratio ‘m’ of a concrete whose permissible compressive stress is ‘C’, may be obtained from the equation.

m = 700/3C
m = 1400/3C
m = 3500/3C
m = 2800/3C

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