Design of Reinforced Concrete Structures (IS456 Recommendations)

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In working stress method, modular ratio =

280/(3*σcbc)

280/(2*σcbc)

260/(3*σcbc)

280/(3*σcbc^2)

Assumed depth of rectangular stress block as per IS456 for working stress method =

0.43d

0.42d

0.40d

0.66d

For limit state of collapse, partial factors used are

1.2 for steel and 1.5 for concrete

1.15 for steel and 1.5 for concrete

1.1 for steel and 1.44 for concrete

1.3 for steel and 1.8 for concrete

none of above

The value of short-term moduli for Concrete, Ec =

5000 x sqrt(σck)

5700 x sqrt(σck)

5100 x sqrt(σck)

none of above

The modular ratio for a section,

increase with increase in strength of concrete

decrease with increase in strength of concrete

always remains the same

decrease with increase in yield strength of steel

To calculate the deflection under live loads, which of the following values has to be used?

Long-term modulus of concrete

Short-term modulus of concrete

Compressive stress in concrete for Limit state design without partial safety factor =

0.67 σck

0.60 σck

0.66 σck

0.65 σck

Limiting value of a section with Fe 500 grade steel =

0.133 σck b (d)^2

0.138 σck b (d)^2

0.148 σck b (d)^2

none of above

As per IS456, the limiting value of the depth of neutral axis,

remains same with change in yield stress

increases with increase in yield stress

decreases with increase in yield stress

none of above

10.

As per IS456, the limiting value of the depth of neutral axis, for Fe 415 grade steel =

0.53 d

0.48 d

0.46 d

none of above

11.

The depth of beam to be considered to calculate nominal shear stress should be

Gross depth of section

Effective depth of section

Depth of concrete under tension

None of above

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