Harmonization of NDPs
In all 59 parts of the Eurocodes there are 1 573 Nationally Determined Parameters (NDPs). In a number of cases, an NDP cannot be represented by a single numerical value. In fact, many NDPs take the form of tables, graphs, acceptance of the recommended procedure, choice of calculation approach among given alternatives, introduction of a new procedure, etc.
| Type | Type Description | Number | % |
|---|---|---|---|
| 1 | Values of parameters | 397 | 26.3 |
| 2 | Reference to some set of values – tables | 169 | 11.2 |
| 3 | Acceptance of the recommended procedure, choice of calculation approach, when alternatives are given, or introduction of a new procedure | 502 | 33.3 |
| 4 | Country specific data | 18 | 1.2 |
| 5 | National charts or tables | 1 | 0.1 |
| 6 | Diagrams | 15 | 1.0 |
| 7 | References to non-contradictory complementary information | 23 | 1.5 |
| 8 | Decision on the application of informative Annexes | 249 | 16.5 |
| 9 | Provision of further, more detailed information | 102 | 6.8 |
| 10 | Reference to information included in an informative annex | 30 | 2.0 |
Among the material Eurocodes, EN 1992: Design of concrete structures and EN 1993: Design of steel structures include the highest amount of NDPs. The objective of further harmonisation for these NDPs, e.g. partial factors for material and product properties, is the adoption of the recommended values.
EN 1991: Actions on structures contains a big number of NDPs, most of them arising from different geographical, geological and climatic conditions. Further harmonisation will be sought with regard to the methodologies used for the assessment of these NDPS.
The database of NDPs is managed by the Safety and Security of Buildings Unit of the DG Joint Research Centre of the European Commission.
Number and percentage of NDPs per NDP type
Number and percentage of NDPs per EN Eurocode
By 7 October 2019, the acceptance average of the recommended values (RVs) was 74%. The analysis was based on 69% of the NDPs with RVs that are expected to be uploaded in the Database.
Acceptance of recommended values per EN Eurocode
Acceptance of recommended values per country
