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RCC Structures Design

RCC Structures Design
According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is

20 kg/cm²
15 kg/cm²
5 kg/cm²
10 kg/cm²

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RCC Structures Design
For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to

25
20
10
15

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RCC Structures Design
If ‘p’ is the net upward pressure on a square footing of side ‘b’ for a square column of side ‘a’, the maximum bending moment is given by

M = pb (b + a)/8
M = pb (b - a)²/4
M = pb (b - a)²/8
M = pb (c - a)/4
M = pb (b + a)/8

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RCC Structures Design
For normal cases, stiffness of a simply supported beam is satisfied if the ratio of its span to its overall depth does not exceed

15
20
25
10

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

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RCC Structures Design
The width of the flange of a L-beam, should be less than

Least of the above
One-sixth of the effective span
Breadth of the rib + half clear distance between ribs
Breadth of the rib + four times thickness of the slab

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