CEN/TC 250

Date: 2025-11

EN 1999‑1‑3:2023/prA1:2025

Secretariat: BSI

Eurocode 9 — Design of aluminium structures — Part 1-3: Structures susceptible to fatigue

Eurocode 9 — Bemessung und Konstruktion von Aluminiumtragwerken — Teil 1-3: Ermüdungsbeanspruchte Tragwerke

Eurocode 9 — Calcul des structures en aluminium — Partie 1-3: Structures sensibles à la fatigue

ICS:

Contents Page

European foreword 3

1 Modifications throughout the whole document 4

2 Modification to 0.1, “Introduction to the Eurocodes” 4

3 Modification to 0.2, “Introduction of EN 1999 (all parts)” 4

4 Modification to 1.1, “Scope of EN 1999‑1‑3” 4

5 Modification to Clause 2, “Normative references” 4

6 Modifications to 4.2.1, “Safe life design (SLD)” 5

7 Modification to 4.2.2, “Damage tolerant design (DTD)” 5

8 Modification to 4.3.1, “Sources of fatigue loading” 5

9 Modification to 4.4, “Partial factors for fatigue loads” 5

10 Modification to D.4, “Stress concentration factors” 6

11 Modification to E.2, “Scope and field of application” 6

European foreword

This document (EN 1999‑1‑3:2023/prA1:2026) has been prepared by Technical Committee CEN/TC 250 “Structural Eurocodes”, the secretariat of which is held by BSI. CEN/TC 250 is responsible for all Structural Eurocodes and has been assigned responsibility for structural and geotechnical design matters by CEN.

This document is currently submitted to the CEN Enquiry.

The first generation of EN Eurocodes was published between 2002 and 2007. This document forms part of the second generation of the Eurocodes, which have been prepared under Mandate M/515 issued to CEN by the European Commission and the European Free Trade Association.

The Eurocodes have been drafted to be used in conjunction with relevant execution, material, product and test standards, and to identify requirements for execution, materials, products and testing that are relied upon by the Eurocodes.

The Eurocodes recognize the responsibility of each Member State and have safeguarded their right to determine values related to regulatory safety matters at national level through the use of National Annexes.

Replace references to EN 1990 with EN 1990‑1.

Replace references to EN 1999‑1‑1:2023 with EN 1999‑1‑1:2023+A1:2026.

Replace references to EN 1999‑1‑4:2023 with EN 1999‑1‑4:2023+A1:2026.

Replace the list with the following:

— EN 1990 Eurocode — Basis of structural and geotechnical design

— EN 1991 Eurocode 1 — Actions on structures

— EN 1992 Eurocode 2 — Design of concrete structures

— EN 1993 Eurocode 3 — Design of steel structures

— EN 1994 Eurocode 4 — Design of composite steel and concrete structures

— EN 1995 Eurocode 5 — Design of timber structures

— EN 1996 Eurocode 6 — Design of masonry structures

— EN 1997 Eurocode 7 — Geotechnical design

— EN 1998 Eurocode 8 — Design of structures for earthquake resistance

— EN 1999 Eurocode 9 — Design of aluminium structures

— EN 19100 Eurocode 10 — Design of structural glass

— New parts are under development, e.g. Eurocode for design of fibre-polymer composite structures and design of tensioned membrane structures.

Add the following as a new fourth paragraph:

“For the design of new structures, EN 1999 (all parts) is intended to be used, for direct application, together with EN 1990‑1 and the other Eurocodes.”

Replace “EN 1999‑1‑1” with “EN 1999‑1‑3” in (1).

Replace the reference to EN 1990 with the following:

“EN 1990‑1:2023+A1:2026, Eurocode — Basis of structural and geotechnical design — Part 1: New structures”

Replace (1) with the following:

“(1) The fatigue design of aluminium structures shall be in accordance with the general provisions given in EN 1990‑1 the loads specified in 4.3 and the specific design provisions for aluminium structures given in the other relevant parts of EN 1999 (all parts).”

Add the following after (1) and renumber the following paragraph:

“(2) The safe life design approach should provide an appropriate level of reliability that the performance of a structure will not be impaired throughout its design service life without the need for regular in-service inspection or monitoring for fatigue cracks.

(3) The safe life concept should be applied in cases where local formation of cracks in one component could rapidly lead to failure of a structural element or structure.

(4) Constructional details, materials and stress levels should be selected to ensure that an appropriate level of reliability in accordance with EN 1990‑1, at least equal to the reliability required for ultimate limit state verification, is achieved at the end of the design service life.”

Add the following after (2):

“(3) Constructional details, materials and stress levels should be selected to ensure that an appropriate level of reliability in accordance with EN 1990‑1, at least equal to the reliability required for ultimate limit state verification, is achieved at the end of each in-service inspection interval, so that in the event of the formation of cracks one or all of the following occurs:

— propagation rates are low, and cracks are easily detectable prior to failure;

— multiple load paths exist;

— crack-arresting constructional details prevent progressive damage.

NOTE The verification of the fatigue design situation includes long-term uncertainties, related to the fatigue resistance and actions, such that the possibility for fatigue cracking cannot be completely excluded but only reduced to an acceptable likelihood of occurrence.”

Replace the first sentence in (2) with the following:

“The fatigue loading should be obtained from EN 1991 (all parts). For loads not covered by EN 1991 (all parts), other relevant European Standards may be used.”

Replace “1,0” with “as given in 8.3.3.6 in EN 1990‑1:2023+A1:2026” in NOTE 1 in (1).

Replace “4.3.2(6)” with “4.3.2(5)” in NOTE 2 in (1).

Replace Figure D.1 with the following:

Key

1 free edge

2 stress fluctuation

Figure D.1 — Typical stress concentration factors from rounded corners in flat plate — Fatigue stress concentration factor K_gt for unreinforced apertures based on net stress at X

Delete “for specific constructional detail types is 1,0 and” in the NOTE to (6).