What are the National Annexes?
The Eurocodes allow choice of safety related parameters and certain country-specific data, known collectively as Nationally Determined Parameters (NDPs). Each country can publish its chosen values for the NDPs in a National Annex that will accompany the Eurocode part. The parameters left open for national choice are, generally: partial safety factors; the chosen design life for structures; country specific data such as snow maps, wind maps, isotherm maps and seismic maps; certain additional information on aspects such as durability; some additional safety-related parameters; and decisions on the status of informative annexes in the Eurocode part. In addition, the National Annex may contain references to non-contradictory complementary information. The National Annex combined with the national title page and national foreword form the British Standard implementing the European Standard. All UK National Annexes relevant to bridge design have now been published and must be used in conjunc
