3. Calculating cable post-tensioning
The prestressing force varies both :
in space, with the abscissa along the cable, due to friction ;
over time, due to concrete shrinkage and creep on the one hand, and steel relaxation on the other.
Voltage losses can be broken down into two categories:
instantaneous losses ;
deferred losses.
3.1 Voltage at origin
This is the force imposed on the reinforcement in front of an active anchor and the associated expansion device (trumpet or tromplaque), on the concrete side, at the moment of tensioning, before the force is transferred to the anchor (figure...
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Calculating cable post-tensioning
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