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Which of the following losses occurs only in post-tensioning pre-stressed concrete structures

Which of the following losses occurs only in post-tensioning pre-stressed concrete structures Correct Answer Loss due to friction

Concept:

Loss due to friction and anchorage slip occurs only in the post-tensioned beam.

  • In prestressed concrete, the most important parameter is the prestressing force.
  • If the prestressing force reduces with time, prestresses also get reduced. 
  • Various reductions of the prestressing force are termed as the losses in prestressing.
  • Total loss of prestress consists of those losses which are instantaneous at the transfer stage as well as those which are time-dependent. 

Important Points

Losses of prestress:

 

Pre-tensioning

  

Post-Tensioning

1.

Elastic shortening loss

1.

No elastic shortening loss in cables if pulled simultaneously, however, losses will be there if cables are pulled are by one.

2.

Creep loss

2.

Friction loss

3.

Shrinkage loss

3.

Anchor slip loss

4.

Relaxation loss

4.

Creep loss
   

5.

Shrinkage & Relaxation

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