PSI - Issue 19

Mladen Lukić / Procedia Structural Integrity 19 (2019) 655–664 Author name / Structural Integrity Procedia 00 (2019) 000–000

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relevant for the evolution of the Eurocodes during several ENC meetings in 2008 and 2009. On the basis of CEN answer to Mandate M/466 (2010) dated 28 June 2011, Mandate M/515 EN (2012) was established to initiate the process of further evolution of the Eurocodes with the following principal goals: 1. Significant reduction of the number of NDPs; 2. Incorporation of recent results of international studies from scientific and technical associations and results from research programmes relevant to innovation and contribution of structural design to sustainability; 3. Adoption, where relevant, of ISO standards to supplement the Eurocode family; 4. Simplification of rules, where relevant, for limited and well identified fields of application; 5. Development of auxiliary guidance documents to facilitate feedback from stakeholders and the practical local implementation; 6. Development of background documents justifying changes. CEN Technical Committee 250 in charge of structural Eurocodes issued the Response to Mandate M/515 (2013) to fulfil the requirements of Mandate M/515 EN (2012). Its aim is the development and publication of the second generation of Eurocodes, including, where relevant, new standards, new parts of existing standards, and incorporation of new performance requirements and design methods across multiple standards. 2.2. Revision of EN 1993-1-9 (2005) In the Response to Mandate M/515 (2013) is included also the revision of EN 1993-1-9 (2005). That revision is designated Task 8 and its scope is:  Harmonization with other EN standards e.g. EN 1991-2 (2003), EN 1993-1-11 (2006), EN 1993-2 (2006), EN 1090-2 (2018) and EN ISO 5817 (2014)  Integration of new experimental results  Enlargement of fatigue analysis methods and rules to come along with modern design practice  Integration of new execution tendencies  Reducing the number of NDPs and NCCI based on an evaluation of all available NAs. Starting documents for such a revision are the actual EN 1993-1-9 (2005) and its available background documents and NAs, scientific papers published in journals, existing research results, such as RFCS BriFaG (2013), IIW Fatigue Recommendations, ECCS TC6 (Technical Committee 6 “Fatigue and Fracture”) documents. In drafting the new work, care is needed to be as clear as possible, to use simple routes throughout the document, and to avoid additional and/or empirical rules for particular structure or structural-element types, all to the extent that is reasonably practical. This revision is divided in 11 sub-tasks, as specified in Table 1.

Table 1. Sub-tasks for the revision of EN 1993-1-9 (2005)

Sub-task

Interdependency

EC priority

1 2 3 4 5 7 8 9

Reduction in number of national choices

- -

Yes Yes

Enhanced ease of use

Partial safety factors for fatigue strength Hot spot stress method in fatigue Fatigue loads on orthotropic decks

SC10.T1

No No

SC3 ad-hoc group

SC1.T9, SC3.T10, HG-B.T1&T2

Yes Yes Yes

6 Harmonization of fatigue rules with other parts of EN 1993 SC3.T10, SC3.T11, SC3.T13

Fatigue data analysis

SC10.T1

Updating of detail categories (fatigue strength) tables

SC3.T10, SC3.T11, SC3.T13, WG2.T1 Yes

Execution classes

EN 1090 & ISO 5817 SC3.T10, SC3.T13

Yes

10 Multi-axial fatigue 11 Post-weld treatment

No No

WG2.T1