The following loss does not occur in Pre-tensioning of concretea)Relaxation of stress in steelb)Shrinkage of concretec)Frictiond)Creep of ConcreteCorrect answer is option 'C'. Can you explain this answer?

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The following loss does not occur in Pre-tensioning of concrete

a)
Relaxation of stress in steel
b)
Shrinkage of concrete
c)
Friction
d)
Creep of Concrete

Correct answer is option 'C'. Can you explain this answer?

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Test: Loss of Prestress

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The following loss does not occur in Pre-tensioning of concretea)Relax...

Loss due to Friction: The friction generated at the interface of concrete and steel during the stretching of a curved tendon in a post-tensioned member. The loss due to friction does not occur in pre-tensioned members because there is no concrete during the stretching of the tendons.

Important Points

Loss due to Elastic Shortening: When the tendons are cut and the prestressing force is transferred to the member, the concrete undergoes immediate shortening due to the prestress.
Loss due to Relaxation: Relaxation is assumed to mean the loss of stress in steel under nearly constant strain at a constant temperature. It is similar to the creep of concrete. This loss is generally of the order of 2 to 8% of the initial stress.
Loss due to Anchorage Slip: In a post-tensioned member, the is loss of prestress due to the consequent reduction in the length of the tendon. The loss due to anchorage does not occur in pre-tensioned members.

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The following loss does not occur in Pre-tensioning of concretea)Relaxation of stress in steelb)Shrinkage of concretec)Frictiond)Creep of ConcreteCorrect answer is option 'C'. Can you explain this answer?

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