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The Eurocodes and their national annexes

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What are Eurocodes used for?

The Eurocodes are a set European standards, of voluntary application, which harmonize the methods of calculation used to verify the stability and sizing of the various components of buildings or structures. They are recommanded to design concrete structures, metal, composite steel/concrete structures, masonry, wood, aluminum, geotechnical works and their seismic resistance.

Normative references

The Eurocodes are design european codes for construction. Used with their national annexes, they replace the national codes and allow companies to access to the markets of other member countries.

Ten groups of texts form the Eurocodes corpus and can be divided into two families:
The last Eurocode, EN1990 (Eurocode 0): Basis of structural design, is intended to be used, for direct application, together with Eurocodes EN 1991 to 1999. It describes the Principles and requirements for safety, serviceability and durability of structures. It is based on the limit state concept used in conjunction with a partial factor method.

National choices

The national annexes provide "nationally determined parameters" (NDP) to certain clauses of the European standards EN 199x authorizing a national choice. They specify the non-contradictory complementary information (NCCI) to facilitate the application of the standards. They are inseparable from the standards to which it refers.

This annexes have generally a prefix who indicate of the concerned country, some examples:
Prefix Meaning Application zone
EN European Norm Europe
BS British Standards United Kingdom
DIN Deutsches Institut für Normung Germany
IS Irish Standards Ireland
NBN Bureau de Normalisation Belgium
NF Norme Française France


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