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Reinforced Cement Concrete

Creep and Shrinkage Loss

An ordinary m...

Question

An ordinary mild steel bar has been prestressed to a working stress of 200 MPa. Young's modulus of steel is 200 GPa. Permanent negative strain due to shrinkage and creep is 0.0008. How much is the effective stress left in steel?

A

184 MPa

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B

160 MPa

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C

40 MPa

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D

16 MPa

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Solution

The correct option is C 40 MPa
Loss of stress due to shrinkage and creep
$= 200 \times 10^{3} \times 0.0008 = 160 M P a$
Effective stress left $= 200 - 160 = 40 M P a$

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