D5.D.3.6 Clause 184.108.40.206 – Slenderness for flexural buckling
The Dutch NA requires the implementation of clause 220.127.116.11 and 18.104.22.168.2 of NEN 6770 and clause 22.214.171.124 of NEN 6771.
Clause 126.96.36.199 (NEN 6770)
This clause gives the equations to evaluate the effective lengths for various support conditions. STAAD.Pro uses the effective length factor "K" which allows the user to set/modify the effective lengths for a member.
Clause 188.8.131.52.2 (NEN 6770)
This clause gives methods to evaluate the buckling length of lattice sections. We do not deal with latticed section in the current version of STAAD.Pro. In any case the buckling length can be adjusted using the "K" factor.