Details of acceptable methods for non-linear analysis and safetyformat
Eurocode 2 part 2: Design of concrete bridge structures 5.7 (105)
If one analysis is not sufficient to verify all the failure mechanisms, separate additional analyses should be carried out for non-linear analysis.
The recommended details of acceptable methods for non-linear analyis and safety format are given in Note 1 and Note 2. Cf the standard for more details.