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RCC Structures Design

RCC Structures Design
If the length of an intermediate span of a continuous slab is 5 m, the length of the end span is kept

4.7 m
4.5 m
4.0 m
4.1 m

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RCC Structures Design
If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is

D = W (a - b)/4a²bq
D = W (a² - b²)/4a²bq
D = W (a² - b²)/4abq
D = W (a² - b²)/8a²bq

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RCC Structures Design
If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by

(5/6) (r/1 + r²) M
(5/6) (r²/1 + r²) M
(5/6) (r²/1 + r⁴) M
(5/6) (r²/1 + r³) M

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RCC Structures Design
If the permissible compressive stress for a concrete in bending is C kg/m², the modular ratio is

2300/2C
2800/C
2800/C²
2800/3C

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RCC Structures Design
Spacing of stirrups in a rectangular beam, is

Kept constant throughout the length
Increased at the centre of the beam
Decreased towards the centre of the beam
Increased at the ends

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

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

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