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D5.D.7.7 Clause 6.3.3(5) – Interaction factors kyy, kyz, kzy, and kzz

The Finnish NA recommends the use of equations in Annex A or Annex B of SFS-EN 1993-1-1 to calculate these interaction factors. STAAD.Pro uses the method in Annex B by default. This implementation of the Finnish NA will also use Annex B for Cl.6.3.3 checks.