Simplified criterion for global second order effects in buildings: the value of k2
Eurocode 2 part 1-1: Design of concrete structures 188.8.131.52 (2)
Global second order effects in buildings may be ignored if:
k1 in Expression (5.18) may be replaced by k2 if it can be verified that bracing members are uncracked in ultimate limit state.
The recommended value of k2 when ignoring the global second order effects is 0,62.