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RCC Structures Design

RCC Structures Design
For stairs spanning l meters longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is

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RCC Structures Design
To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than

b/3
b/5
b/6
b/4

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RCC Structures Design
To ensure uniform pressure distribution, the thickness of the foundation, is

Kept uniform throughout
Decreased gradually towards the edge
Kept zero at the edge
Increased gradually towards the edge

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RCC Structures Design
The Young's modulus of elasticity of steel, is

150 KN/mm²
200 KN/mm²
275 KN/mm²
250 KN/mm²

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RCC Structures Design
If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment

WL/6
WL/4
WL/8
WL/2

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

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