STAAD.Pro HelpDesignD. Design CodesD5.European Codes D5.European Codes D5.A. European Codes - Steel Design to Eurocode 3 [EN1993-1-1:2005] STAAD.Pro is capable of performing steel design based on the European code EC3 BS EN 1993-1-1:2005 Eurocode 3: Design of steel structures Part 1.1 General rules and rules for buildings.D5.B. European Codes - National Annexes to Eurocode 3 [EN1993-1-1:2005]A number of countries that have signed up to the replace their current steel design standards with the Eurocode, EN 1993-1-1:2005, known commonly as Eurocode 3, have published their National Annex documents. These documents make small changes to the base document and STAAD.Pro has been updated to incorporate some of these National Annex documents. D5.C. European Codes - Timber Design Per EC 5: Part1-1Parent Topic: D. Design Codes