In post-tensioning, the elastic loss in a stressed tendon resulting from the shortening of the member when additional tendons are stressed is called as

In post-tensioning, the elastic loss in a stressed tendon resulting from the shortening of the member when additional tendons are stressed is called as Correct Answer Sequence- stressing loss

Explanation:

Loss due to elastic shortening in the post-tensioned beam

  • Case 1:
    • If there is only one wire to be tensioned or There are multiple wires but all tension at the same time, in that case, Elastic shortening of the concrete takes place at the time of tensioning of wires, so there will be no further elastic shortening of concrete after anchoring the wires. So there will be no loss of stress in steel due to the elastic shortening of concrete. 
  • Case 2:
    • If there are multiple wires and wires are tensioned one after another then in that case losses occur due to elastic shortening.
    • Tensioned the wire one after the other is known as Subsequent tensioning and losses are known as Sequence stressing losses 

Important Points

 Losses of prestress:

Losses in pre-tensioned member Losses in post-tensioned member
Loss due to elastic deformation of concrete

If wires are tensioned simultaneously, then no loss due to elastic deformation of concrete but however if the wires are tensioned successively, then loss due to elastic deformation occurs

Loss due to stress relaxation in steel Loss due to stress relaxation in steel
Loss due to creep and shrinkage of concrete Loss due to creep and shrinkage of concrete
No loss due to anchorage slip and friction Loss due to anchorage slip and friction

Related Questions

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‘P’ is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The minimum stress ‘f’ on the beam subjected to a maximum bending moment ‘M’ is
‘P’ is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The maximum stress ‘f’ in the beam, subjected to a maximum bending moment ‘M’, is