Friction between the tendons and duct developed along its length and this causes the loss in tendon force.
Other contributing
factors in losses include lock-off, elastic shortening, creep and shrinkage of
concrete, and relaxation of tendon.
Tendons are
usually stressed up to 75% to 80% of ultimate tensile strength (UTS) after
being released by jack.
Force in
post-tensioning tendon can achieve a maximum of 70% UTS, while that for pre-tensioning
tendon is 75%.
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