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Reinforced Cement Concrete

Slip Loss and Relaxation of Steel

the magnitude...

Question

the magnitude of loss of prestress due to relaxation of steel is in the range of

A

zero to 1%

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B

2 to 8%

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C

8 to 12%

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D

12 to 14%

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Solution

The correct option is B 2 to 8%
The relaxation loss in prestress depends upon the initial stress in the wires. Its magnitude is 2-8%.

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Similar questions

Q. The loss due to relaxation of stress in steel in PSC member depends on

1 and 2 only
2 and 3 only
1,2 and 3
1 and 3 only

Q. The loss of prestress due to elastic shortening of concrete is least in:

Assertion (A):

Losses in prestress of pretensioned beam are more than the losses in post-tensioned beam.

Reason (R) :

This is partially due to the effect of elastic shortening.

Q. The loss in prestress (in MPa) due to slip of

4

m m

in a post tensioned beam of span

25

m

with a initial prestress of

1200

M P a

E_{s} = 210

G P a

(A):

Losses in prestress in pre-tensioned beams are more than the losses in post-tensioned beams.

(R):

This is partially due to the effect of elastic shortening.

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