CEN/TC 250

Date: 2026-01

EN 1999-1-2:2023/prA1:2026

Secretariat: BSI

Eurocode 9 — Design of aluminium structures — Part 1-2: Structural fire design

Eurocode 9 — Bemessung und Konstruktion von Aluminiumtragwerken — Teil 1-2: Tragwerksbemessung für den Brandfall

Eurocode 9 — Calcul des structures en aluminium — Partie 1-2: Calcul du comportement au feu

Contents Page

European foreword 3

1 Modifications throughout the whole document 4

2 Modifications to the Introduction 4

3 Modification to Clause 1, "Scope" 4

4 Modifications to Clause 2, "Normative references" 5

5 Modifications to 4.1, "General" 5

6 Modifications to 4.2, "Nominal fire exposure" 5

7 Modifications to 4.5, "Design values of material properties" 5

8 Modification to 4.6, "Verification methods" 5

9 Modifications to 4.7, "Member analysis" 6

10 Modification to 4.8, "Analysis of part of the structure" 6

11 Modification to 5.2.1.4, "Emissivity coefficient" 6

12 Modification to Clause 6, "Tabulated design data" 6

13 Modification to 7.2.3, "Beams" 6

14 Modification to 8.3, "Mechanical analysis" 6

15 Modification to 8.4, "Validation of advanced design methods" 7

16 Modification to B.7.2, "Flame emissivity" 7

17 Modifications to the Bibliography 7

European foreword

This document (EN 1999-1-2:2023/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.

This document will amend EN 1999-1-2:2023.

NOTE Some modifications are purely editorial corrections to improve the quality of the document and these will not be tagged in the consolidated publication, as noted after the modification.

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 1999-1-3:2023” with “EN 1999-1-3:2023+A1:2026”.

Replace references to “EN 1999-1-4:2023” with “EN 1999-1-4:2023+A1:2026”.

Replace references to “EN 1999-1-5:2023” with “EN 1999-1-5:2023+A1:2026”.

Replace “prEN 1991-1-2:2021”, “prEN 1991-1–2:2021” and “prEN 1991 1-2:2021” with “EN 1991-1-2:2024”.

In 0.1, 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”.

In 0.2, 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.”.

In 0.5, add “4.7(2)” to the list of clauses where National choice is allowed in EN 1999-1-2.

In 1.2, delete paragraph (2) and renumber the following paragraph.

Replace the reference to EN 1990 with the following:

“EN 1990-1, Eurocode — Basis of structural and geotechnical design — Part 1: New structures”.

Add the following reference:

“EN 1991 (all parts), Eurocode 1 — Actions on structures”.

Replace the reference to prEN 1991-1-2:2021 and corresponding footnote with the following:

"EN 1991-1-2:2024, Eurocode 1 - Actions on structures - Part 1-2: Actions on structures exposed to fire".

Add the following as a new paragraph (1), and renumber the following paragraphs:

“(1) The structural fire design shall be in accordance with the general rules given in EN 1990-1 and EN 1991 (all parts) and the specific design provisions for aluminium structures given in EN 1999-1-1.”

Add the following as a new paragraph (7):

“(7) Aluminium structures designed in accordance with EN 1999-1-1 should be considered to have sufficient minimum robustness for the accidental fire design case. Where additional requirements are necessary, the procedures of EN 1991-1-7:2025, Annex A, may apply.”

Replace “(2)” with “NOTE 1”.

Replace “(3)” with “NOTE 2”.

Replace “(4)” with “NOTE 3”.

Replace “(5)” with “NOTE 4”.

Replace “(6)” with “(2)”.

Replace “shall” with “should” in (2).

Replace “determined” with “calculated” in (1).

Replace “EN 1999-1-1:2023” with “EN 1999-1-1” in key to Formula (4.1).

Replace “6.3 of prEN 1991-1–2:2021” with “EN 1991-1-2” in the definition for Ed,fi under Formula (4.2) in (2).

Replace “EN 1990” with “7.1.5 of EN 1990-1:2026” in (3).

Replace “see 6”, “see 7” and “see 8” in the list in paragraph (5) with “see Clause 6”, “see Clause 7” and “see Clause 8” (untagged).

Replace paragraph (2) with the following:

“(2) When E_d,fi is obtained in accordance with EN 1991-1-2:2021, 6.3.2(4), the safe-sided values of η_fi should be used.

NOTE The recommended value of η_fi is 0,65, except for imposed loads classified as category E according to EN 1990‑1 (areas susceptible to accumulation of goods, including access areas) where the recommended value of η_fi is 0,7, unless the National Annex gives different values.”.

Delete the second sentence in paragraph (3): “The effects of axial or in-plain thermal expansions may be neglected.”.

Add as a new paragraph (4): “The effects of axial or in-plane thermal expansions may be neglected.” and renumber the following paragraphs.

In the new paragraph (6), replace: “(5) Tabulated design data for simplified or advanced design methods given in Clauses 6, 7 and 8 respectively may be taken as suitable for verifying members under fire conditions.”

with the following:

"(6) Tabulated design data, simplified or advanced design methods given respectively in Clauses 6, 7 and 8, may be used for verifying members under fire conditions.".

Replace “6.3 of prEN 1991-1-2:2021” with “EN 1991-1-2:2024, 6.3” in (1).

Delete “addition to” in (1). (untagged)

Delete “They may be used only within their range of application, without extrapolation outside.” in (3).

Add the following as a new paragraph (4):

“(4) Tabulated design data shall be used only for standard fire exposure and without extrapolation outside their range of application.”.

Replace “(7).5)” with “(7.5)” in the NOTE in (5). (untagged)

Replace “should” with “shall” in (3).

Replace “should” with “shall” in (5).

Replace “should” with “shall” and replace “calculation” with “design” in (6).

Replace paragraph (1) with the following:

“(1) The advanced design methods should be validated on the basis of relevant test results.”.

Delete the NOTE following (1).

Replace “df” with “df” in (1). (untagged)

Replace “df,i” with “di” in (1).

In the introductory sentence, replace “two sections” with “three sections” and insert the following as a new second item in the list:

“— References contained in permissions (“may”-clauses),”.

After the reference ‘EN 13501-2’, add the following new sub-heading and paragraph, followed by the reference ‘EN 1991-1-7:2025’ to read:

“References contained in permissions (i.e. “may” clauses)

The following documents are referred to in the text in such a way that some or all of their content expresses a course of action permissible within the limits of the Eurocodes. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1991-1-7:2025, Eurocode 1 - Actions on structures - Part 1-7: Accidental actions”. 

Add the following new entry under ‘References contained as information (e.g. through “can” clauses)’:

“EN 1090-1, Execution of steel structures and aluminium structures - Part 1: Requirements for conformity assessment of structural components”.