Beams: the minimum area of longitudinal reinforcement As,min
Eurocode 2 part 1-1: Design of concrete structures 22.214.171.124 (1)
The area of longitudinal tension reinforcement should not be taken as less than As,min.
The recommended value for the minimum reinforcement areas is:
|As,min = 0,26 (fctm / fyk) bt d ≥ 0,0013 bt d||(9.1N)|
Alternatively, for secondary elements, where some risk of brittle failure may be accepted, As,min may be taken as 1,2 times the area required in ULS verification.