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Concrete Technology and Design of Concrete Structures

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
0.67 fy
0.87 fy
0.37 fy

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Concrete Technology and Design of Concrete Structures
As compared to ordinary portland cement, use of pozzuolanic cement

increases strength
increases shrinkage
reduces workability
increases bleeding

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Concrete Technology and Design of Concrete Structures
For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be

900 mm
more than 1 m
600 mm
750 mm

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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
The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by

fcr
fcr>fcs>fc.
fc5>fcr>fC
tcr – rcs = tct

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Concrete Technology and Design of Concrete Structures
In a spherical dome the hoop stress due to a concentrated load at crown is

partly compressive and partly tensile
tensile everywhere
zero
compressive everywhere

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