Other verifications of fatigue: the values of k1 and k2
Eurocode 2 part 1-1: Design of concrete structures 6.8.6 (1)
For unwelded reinforcing bars under tension adequate fatigue resistance may be assumed if the stress range under frequent cyclic load combined with the basic combination is ΔσS ≤ k1.
For welded reinforcing bars under tension adequate fatigue resistance may be assumed if the stress range under frequent cyclic load combined with the basic combination is ΔσS ≤ k2.
Recommendation
The recommended values of k1 and k2 for this fatigue verification are 70 MPa and 35 MPa respectively .
