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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

dependent on grade of concrete also
0.40 d
0.35 d
0.45 d

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Concrete Technology and Design of Concrete Structures
According to IS: 456-1978, the maximum reinforcement in a column is

2 %
8 %
6 %
4%

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Concrete Technology and Design of Concrete Structures
The depth of footing for an isolated column is governed byi) maximum bending momentii) shear forceiii) punching shear The correct answer is

(i) and (iii)
(i), (ii) and (iii)
only (i)
(i) and (ii)

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Concrete Technology and Design of Concrete Structures
The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (where xu is the depth of neutral axis at the limit state of collapse)

0.446 xu
0.416 xu
0.367 xu
0.573 xu

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Concrete Technology and Design of Concrete Structures
The purpose of reinforcement in pre-stressed concrete is

To impart initial compressive stress in concrete
To provide adequate bond stress
To resist tensile stresses
All of these

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Concrete Technology and Design of Concrete Structures
According to IS : 456- 1978, minimum slenderness ratio for a short column is

more than 24
between 18 and 24
less than 12
less than 18

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