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Anchorages and couplers for prestressing tendons: the value of X % and the distance a

Eurocode 2 part 2: Design of concrete bridge structures   8.10.4 (105)

The placing of couplers on more than X % of the tendons at one cross-section should be avoided (unless specific conditions are satisfied).

Where a proportion of tendons are joined with couplers at a particular cross section, remaining tendons may not be joined with couplers within distance a of the that cross section.


The recommended value for X is 50 %. The recommended value for the maximum percentage of tendons to be coupled at a section is 67 %. The recommended value for the distance a is given in Table 8.101N.

National choice

The percentage of tendons
The distance