# Overstressing force during tensioning: the value of `k`_{3}

_{3}

## Eurocode 2 part 1-1: Design of concrete structures 5.10.2.1 (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 `P _{max}` (see § 5.10.2.1 (1)P) may be increased to

`k`⋅

_{3}`f`⋅

_{p0,1k}`A`(e.g. for the occurrence of an unexpected high friction in long-line pretensioning).

_{p}## Recommendation

The recommended value of `k _{3}` for the calculation of overstressing force is 0,95.