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Design assumptions for prestressing tendons: the strain limit εud

Eurocode 2 part 1-1: Design of concrete structures   3.3.6 (7)

For cross-section design, either of the following assumptions may be made (see Figure 3.10):

- an inclined branch, with a strain limit εud. The design may also be based on the actual stress/strain relationship, if this is known, with stress above the elastic limit reduced analogously with Figure 3.10, or

- a horizontal top branch without strain limit.


The recommended value for the strain limit εud is 0,9εuk. If more accurate values are not known the recommended values are εud = 0,02 and fp0,1k/fpk = 0,9.

National choice