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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Ratio of permissible stress in direct compression and bending compression is

greater than 2
between 1.5 and 2.0
between 1 and 1.5
less than 1

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Concrete Technology and Design of Concrete Structures
A higher modular ratio shows

higher tensile strength of steel
higher compressive strength of con-crete
lower tensile strength of steel
lower compressive strength of concrete

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Concrete Technology and Design of Concrete Structures
Modulus of elasticity of steel as per IS : 456-1978 shall be taken as

2xl06N/cm²
200kN/mm²
20 kN/cm²
200 kN/cm²

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Concrete Technology and Design of Concrete Structures
The design yield stress of steel according to IS: 456-1978 is (where fy is the characteristic yield strength of steel)

0.57 fy
0.37 fy
0.87 fy
0.67 fy

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Concrete Technology and Design of Concrete Structures
For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

50 mm
45mm
60 mm
40 mm

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Concrete Technology and Design of Concrete Structures
According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

0.43 d
0.85 d
0.68 d
0.55 d

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