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Overstressing force during tensioning: the value of k3

Eurocode 2 part 1-1: Design of concrete structures (2)

Overstressing is permitted if the force in the jack can be measured to an accuracy of ± 5% of the final value of the prestressing force. In such cases the maximum prestressing force Pmax (see § (1)P) may be increased to k3fp0,1kAp (e.g. for the occurrence of an unexpected high friction in long-line pretensioning).


The recommended value of k3 for the calculation of overstressing force is 0,95.

National choice