Corbels: the area ratio of closed vertical links k2
Eurocode 2 part 1-1: Design of concrete structures J.3 (3) - Annex J (informative)
If ac > 0,5hc and FEd > VRd,c (see § 6.2.2), closed vertical links As,lnk ≥ k2FEd/fyd should be provided in addition to the main tension reinforcement (see Figure J.6 (b)).
Recommendation
The recommended value of k2 is 0,5.
