PSI - Issue 57

Mladen Lukić et al. / Procedia Structural Integrity 57 (2024) 550 – 559 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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The revision followed a “ Systematic review ” process during which CEN members states had the opportunity to comment on the content and the desired improvements of the current standard EN 1993-1-9 (2005), on the available background documents and NationalAnnexes, scientific papers published in journals, existing research results, such as RFCS BriFaG final report (Lukić et al., 2013), fatigue design recommendations of IIW (Hobbacher, 2016) and ECCS (European Convention for Constructional Steelwork). The improvements concern in detail: • New structure : improvement of clarity and accommodation to the new structure in all Eurocodes, see Figure 1;

Fig. 1. Improved structure of draft standard prEN 1993-1-9 (2022)

• Terminology : extension, coherence with that used in EN 1990 (2002), avoidance of conflicts between e.g. concepts (general notions such as safe life design or damage tolerant design) and methods (ways of proceeding, of computing, of verifying); • Definitions : extension, clarification of certain issues e.g. stress raising effects, safe life, damage tolerance, inspection, maintenance • Further design stress methods : effective notch stress method added to nominal and hot spot stress methods; see Figure 2 for the relation between the newly defined stress raising effects and the choice of an appropriate design stress method;

Fig. 2. Overview about stress raising effects and design stress methods in draft standard prEN 1993-1-9 (2022)