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UPSC Civil Service Exam Questions

Q1:

The losses in prestress in pre-tensioning system are due to :
1. elastic deformation of concrete when wires are tensioned successively
2. friction
3. shrinkage and creep of concrete
Select the correct answer using the codes given below:

A 1, 2 and 3

B 2 and 3

C 1 alone

D 3 alone

ANS:A - 1, 2 and 3

Loss of prestress in the pretensioning system.

1) Elastic deformation of concrete(Elastic shortening of concrete).
2) Creep and shrinkage of concrete.
3) Relaxation of steel.
4) Creep of steel or loss due to stress Relaxation.



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