SIST EN 1999-1-1:2023/kprA1:2026
(Amendment)Eurocode 9 - Design of aluminium structures - Part 1-1: General rules
- Abstract
EN 1999-1-1 gives basic design rules for structures made of wrought aluminium alloys and limited guidance for cast alloys (see Clause 5 and Annex C).
This document does not cover the following, unless otherwise explicitly stated in this document:
- members with material thickness less than 0,6 mm;
- welded members with material thickness less than 1,5 mm;
- connections with:
- steel bolts and pins with diameter less than 5 mm;
- aluminium bolts and pins with diameter less than 8 mm;
- rivets and thread forming screws with diameter less than 3,9 mm.
- Status
- Not Published
- Public Enquiry End Date
- 28-May-2026
- Technical Committee
- KON - Structures
- Current Stage
- 5020 - Formal vote (FV) (Adopted Project)
- Start Date
- 02-Nov-2026
- Due Date
- 21-Dec-2026
SIST EN 1999-1-1:2023/kprA1:2026 is the Slovenian draft amendment to Eurocode 9 - Design of aluminium structures - Part 1-1: General rules, published by SIST and aligned with EN 1999-1-1:2023/prA1:2026. It updates the basic design rules for structures made of wrought aluminium alloys and gives limited guidance for cast alloys, for engineers, designers and reviewers working with aluminium members, joints, welds and bridge structures.
This issue is a draft for enquiry, so it modifies EN 1999-1-1:2023 rather than standing alone.
What does SIST EN 1999-1-1:2023/kprA1:2026 specify?
SIST EN 1999-1-1:2023/kprA1:2026 is an amendment to the general rules for aluminium structural design. The base standard gives basic design rules for wrought aluminium alloys and limited guidance for cast alloys in Clause 5 and Annex C.
The scope excludes the following unless the document says otherwise:
- members with material thickness less than 0.6 mm
- welded members with material thickness less than 1.5 mm
- connections with steel bolts and pins smaller than 5 mm in diameter
- connections with aluminium bolts and pins smaller than 8 mm in diameter
- rivets and thread forming screws smaller than 3.9 mm in diameter
The amendment is organised as a European foreword and 101 numbered modification items. These changes run across the whole document, the Introduction, Clause 2, terms and symbols, Clauses 5 to 10, and Annexes B, C, D, F, G, H, I, K, O, R, S, T and U, followed by a bibliography update.
| Annex | What it covers |
|---|---|
| B | FE-modelling, imperfections, limit state criteria and partial factors |
| C | Guidance for cast alloys |
| D | Durability-related conditions, including contact with timber and immersion in water |
| F | Bi-linear, tri-linear and continuous stress-strain models |
| G | Plastic section modulus |
| H | Boundary values for the ultimate axial load |
| I | Cantilevers with uniform cross-sections symmetrical about the minor axis |
| K | Determination of ultimate bending moment |
| O | Scope, field of application and tensile resistance |
| R | Design rules |
| S | Bridge-related rules, including roads, foot bridges and decks |
| T | Connection classification, bolt shear, testing and gusset plate modelling |
| U | Composite aluminium-concrete beams and connectors |
What are the key requirements of SIST EN 1999-1-1:2023/kprA1:2026?
General basis and terminology
The amendment updates the document-wide reference frame so that EN 1999-1-1 is used with EN 1990-1 and the other Eurocodes listed in the Introduction. In practice, this keeps aluminium design tied to the current Eurocode basis for new structures and to the National Annexes used by each Member State.
It also changes terminology across the document, replacing several occurrences of “component” with “member” and updating definitions and symbols in Clause 3. This matters because consistent wording affects how drawings, calculation sheets and specification text are read.
Clause 5 also revises material-property wording for wrought and casting alloys and the design values of material constants. For users, this means the material data and factors taken from the clause must match the amended wording and symbol set.
Member resistance, buckling and local effects
Clause 7.1.2 now separates semi-continuous and continuous joint models more clearly. A semi-continuous joint model needs explicit structural and stiffness properties of the joint components in global analysis, while a continuous joint model needs only the structural properties of the members. That distinction affects whether connection stiffness must be modelled in the overall analysis.
Clause 8 strengthens the treatment of cross-section classification, local buckling and heat-affected zones. The amendment clarifies how welded cross-section parts are treated, how welds at edges influence classification, and how class 4 local buckling limits are applied. It also updates the rules for the severity and extent of the HAZ, which matters because welds can reduce resistance and change section classification.
Several resistance clauses in 8.2, 8.3, 8.5, 8.7, 8.8 and 8.9 are revised, including net area, bending and shear, bending with axial force, buckling resistance, buckling curves and plate-girder checks. In practice, these are the calculations used to verify member resistance and stability, so the amended formulas and headings must be followed in design checks.
Connections, welds and testing
Clause 10 updates shear and tension connections, weld metal strength, HAZ resistance for fillet welds, bolt-channel joints and design assisted by testing. The amendment also clarifies which bolt property classes are covered in the tension-connection tables. For the reader, that affects fastener selection, joint detailing and the acceptance of test-based verification.
Annex T is especially important for connection classification and gusset-plate modelling. It updates axial stiffness and axial strength classification, bolt-in-shear checks and the use of measured displacement in test-assisted design. That means connection design is tied more directly to the measured behaviour of the actual joint.
Bridges and composite members
Annex S revises bridge-specific rules for robustness, design service life, durability, fatigue loading, road bridges, foot bridges, deck effects, surface finishing, replacement decks and integrated deck structures. If the project is a bridge or deck structure, these changes affect the way global and local actions, fatigue and detailing are checked.
Annex U updates the rules for composite aluminium-concrete beams. It revises structural analysis, effective width, cracking, plastic resisting moment, nonlinear resistance and connector rules, and it removes innovative connectors from the annex. In practice, composite beam design must follow the updated annex together with the relevant EN 1994 provisions.
What terms does SIST EN 1999-1-1:2023/kprA1:2026 define?
- HAZ - the heat-affected zone next to a weld, where material properties and resistance are treated separately.
- FE-modelling - finite element modelling, which Annex B allows for a structure or part of a structure.
- semi-continuous joint model - a joint model that explicitly includes both structural and stiffness properties of the joint components in global analysis.
- continuous joint model - a joint model that uses only the structural properties of the members in global analysis.
- LVDT - the displacement-measuring device named in Annex T for test-assisted connection design.
- μ - the slip factor, efficiency factor and correction factor used in joint and connection calculations.
- National Annexes - the national documents through which Member States set regulatory safety values for Eurocode use.
Who uses SIST EN 1999-1-1:2023/kprA1:2026?
SIST EN 1999-1-1:2023/kprA1:2026 is used by structural engineers, aluminium structure designers, bridge engineers and connection designers. It is also relevant to analysts who use FE-modelling, fabricators who detail welded or bolted aluminium members, and laboratories that support design assisted by testing.
Typical tasks include sizing aluminium members, checking local buckling and HAZ effects, selecting fasteners and weld details, designing road and foot bridges, and verifying composite aluminium-concrete beams. Buyers and specifiers use it to define what design evidence they should expect from suppliers and consultants.
What changed in SIST EN 1999-1-1:2023/kprA1:2026 from the previous edition?
SIST EN 1999-1-1:2023/kprA1:2026 will amend EN 1999-1-1:2023. The draft amendment replaces references to EN 1990 with EN 1990-1 and updates references to EN 1999-1-3 and EN 1999-1-4 to their +A1:2026 versions.
It also revises many clauses and annexes, including joint modelling, cross-section classification, local buckling, HAZ treatment, connections, bridges, FE-modelling and composite aluminium-concrete beam design. The foreword notes that some changes are purely editorial corrections, and Annex U.6.3 on innovative connectors is deleted.
Which standards are used with SIST EN 1999-1-1:2026?
- EN 1990-1 - the basis for structural and geotechnical design for new structures.
- EN 1991 - actions on structures, used for loading and combinations.
- EN 1992 - concrete design, relevant in Annex U for cracked regions and composite behaviour.
- EN 1993 - steel structures, part of the companion Eurocode set named in the Introduction.
- EN 1994 - composite steel and concrete structures, used directly in Annex U.
- EN 1995, EN 1996, EN 1997, EN 1998, EN 19100 - the other Eurocodes listed in the Introduction as part of the same design framework.
- EN 1991-2:2023 - bridge actions, cited in Annex S for road bridges.
- EN 1994-1-1 - the composite structures part used in Annex U for aluminium-concrete beams.
What does the SIST EN 1999-1-1:2023/kprA1:2026 document contain?
The amendment contains revised tables, figures and formulas rather than a new standalone method. It updates stress-strain models in Annex F, section-modulus and axial-load methods in Annexes G and H, cantilever and bending-moment methods in Annexes I and K, and connection test and classification rules in Annex T.
It also replaces figures for deck effects and deep girders in Annex S, and figures and equations for composite section behaviour in Annex U. For users, these are the calculation tools used in design sheets, software checks, test interpretation and project documentation.
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Amends
kSIST FprEN 1999-1-1:2022 - Eurocode 9 - Design of aluminium structures - Part 1-1: General rules - Effective Date
- 30-Jul-2025
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Frequently Asked Questions
SIST EN 1999-1-1:2023/kprA1:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Eurocode 9 - Design of aluminium structures - Part 1-1: General rules". This standard covers: EN 1999-1-1 gives basic design rules for structures made of wrought aluminium alloys and limited guidance for cast alloys (see Clause 5 and Annex C). This document does not cover the following, unless otherwise explicitly stated in this document: - members with material thickness less than 0,6 mm; - welded members with material thickness less than 1,5 mm; - connections with: - steel bolts and pins with diameter less than 5 mm; - aluminium bolts and pins with diameter less than 8 mm; - rivets and thread forming screws with diameter less than 3,9 mm.
EN 1999-1-1 gives basic design rules for structures made of wrought aluminium alloys and limited guidance for cast alloys (see Clause 5 and Annex C). This document does not cover the following, unless otherwise explicitly stated in this document: - members with material thickness less than 0,6 mm; - welded members with material thickness less than 1,5 mm; - connections with: - steel bolts and pins with diameter less than 5 mm; - aluminium bolts and pins with diameter less than 8 mm; - rivets and thread forming screws with diameter less than 3,9 mm.
SIST EN 1999-1-1:2023/kprA1:2026 is classified under the following ICS (International Classification for Standards) categories: 91.010.30 - Technical aspects; 91.080.17 - Aluminium structures. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 1999-1-1:2023/kprA1:2026 has the following relationships with other standards: It is inter standard links to SIST-TP CEN ISO/TR 41030:2025, SIST EN ISO 41017:2024, SIST-TP CEN ISO/TR 41016:2024, kSIST FprEN 1999-1-1:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 1999-1-1:2023/kprA1:2026 is associated with the following European legislation: Standardization Mandates: M/515. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 1999-1-1:2023/kprA1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 1999-1-1:2023/oprA1:2026
01-maj-2026
Evrokod 9 - Projektiranje konstrukcij iz aluminijevih zlitin - 1-1. del: Splošna pravila
Eurocode 9 - Design of aluminium structures - Part 1-1: General rules
Eurocode 9 - Bemessung und Konstruktion von Aluminiumtragwerken - Teil 1-1:
Allgemeine Bemessungsregeln
Eurocode 9 - Calcul des structures en aluminium - Partie 1-1: Règles générales
Ta slovenski standard je istoveten z: EN 1999-1-1:2023/prA1
ICS:
91.010.30 Tehnični vidiki Technical aspects
91.080.17 Aluminijaste konstrukcije Aluminium structures
SIST EN 1999-1-1:2023/oprA1:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
SIST EN 1999-1-1:2023/oprA1:2026
SIST EN 1999-1-1:2023/oprA1:2026
DRAFT
EUROPEAN STANDARD
EN 1999-1-1:2023
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
March 2026
ICS 91.010.30; 91.080.17
English Version
Eurocode 9 - Design of aluminium structures - Part 1-1:
General rules
Eurocode 9 - Calcul des structures en aluminium - Eurocode 9 - Bemessung und Konstruktion von
Partie 1-1: Règles générales Aluminiumtragwerken - Teil 1-1: Allgemeine
Bemessungsregeln
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 250.
This draft amendment A1, if approved, will modify the European Standard EN 1999-1-1:2023. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.
This draft amendment was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1999-1-1:2023/prA1:2026 E
worldwide for CEN national Members.
SIST EN 1999-1-1:2023/oprA1:2026
EN 1999-1-1:2023/prA1:2026 (E)
Contents Page
European foreword . 5
1 Modifications throughout the whole document . 6
2 Modifications to the Introduction . 7
3 Modification to Clause 2, "Normative references" . 8
4 Modifications to 3.1, "Terms and definitions" . 8
5 Modifications to 3.2, "Symbols" . 8
6 Modification to 5.2.2, "Material properties for wrought and casting alloys" . 8
7 Modification to 5.2.5, "Design values of material constants" . 9
8 Modification to 7.1.2, "Joint modelling " . 9
9 Modification to 7.2.2, "Structural stability of frames" . 9
10 Modification to 7.3.2, "Imperfections for global analysis of frames" . 9
11 Modification to 8.1.4.3, "Slenderness parameters" . 9
12 Modifications to 8.1.4.4, "Classification of cross-section parts" . 9
13 Modifications to 8.1.5, "Local buckling resistance in class 4 members" . 10
14 Modification to 8.1.6.1, "General" . 10
15 Modification to 8.1.6.2, "Severity of softening" . 10
16 Modifications to 8.1.6.3, "Extent of HAZ" . 10
17 Modification to 8.2.2.2, "Net area" . 11
18 Modification to 8.2.8, "Bending and shear" . 11
19 Modification to 8.2.9, "Bending and axial force" . 11
20 Modification to 8.3.1.2, "Buckling resistance" . 11
21 Modification to 8.3.1.3, "Buckling curves" . 11
22 Modification to 8.3.3, "Members in bending and axial compression" . 11
23 Modification to 8.3.3.4, "Members containing localised welds" . 11
24 Modification to 8.5.1, "General" . 12
25 Modification to 8.5.2.2, "Constructional details" . 12
26 Modification to 8.6.1, "General" . 12
27 Modifications to 8.7.6, "Buckling load for orthotropic plates" . 12
28 Modification to 8.8.2, "Resistance of plate girders under in-plane bending" . 13
29 Modification to 8.8.4.1, "General" . 13
30 Modification to 8.8.4.2, "Plate girders with web stiffeners at supports" . 13
31 Modification to 8.8.4.3, "Plate girders with intermediate web stiffeners" . 13
32 Modification to 8.8.5.2, "Design resistance" . 13
SIST EN 1999-1-1:2023/oprA1:2026
EN 1999-1-1:2023/prA1:2026 (E)
33 Modification to 8.8.5.5, "Effective loaded length" . 13
34 Modification to 8.8.8.1, "Rigid end post" . 13
35 Modification to 8.8.8.5, "Welds" . 13
36 Modifications to 8.9.3, "Shear force resistance" . 13
37 Modification to 10.5.3.1, "Shear connections" . 14
38 Modifications to 10.5.3.2, "Tension connections" . 14
39 Modification to 10.5.8.1, "General" . 14
40 Modifications to 10.5.10, "Single lap joints of flats with only one row of fasteners" . 14
41 Modification to 10.5.12.1, "General" . 14
42 Modification to 10.6.2.2, "Characteristic strength of weld metal" . 14
43 Modification to 10.6.2.5.3, "Design resistance of HAZ for fillet welds" . 14
44 Modification to 10.6.2.7, "Bending about the weld seam axis for single-sided fillet welds
and butt welds" . 14
45 Modification to 10.9.2, "Bolt-channel joints" . 14
46 Modifications to 10.10.3.1, "General" . 14
47 Modification to B.4, "Modelling". 15
48 Modifications to B.6, "Use of imperfections" . 15
49 Modifications to B.9, "Limit state criteria" . 15
50 Modification to B.10, "Partial factors" . 15
51 Modification to C.3, "General" . 15
52 Modification to D.5.4.3, "Contact with timber" . 15
53 Modification to D.5.4.5, "Immersion in water" . 15
54 Modifications to F.3.2.2, "Bi-linear model" . 15
55 Modifications to F.3.2.3, "Tri-linear model". 16
56 Modifications to F.3.3.3, "Continuous models in the form ε = ε (σ)" . 17
57 Modification to F.4, "Approximate evaluation of ε " . 17
uni,max
58 Modifications to G.10.1, "Plastic section modulus" . 18
59 Modifications to H.5, "Boundary values for the ultimate axial load" . 18
60 Modifications to I.3.4, "Cantilevers with uniform cross-sections symmetrical about the
minor axis" . 18
61 Modifications to K.3, "Determination of ultimate bending moment M " . 19
u
62 Modification to O.2, "Scope and field of application". 19
63 Modification to O.3, "Tensile resistance" . 19
64 Modifications to R.4, "Design" . 19
65 Modification to S.2, "Scope and field of application" . 19
66 Modification to S.4.1.1, "Robustness" . 19
67 Modifications to S.4.1.2, "Design service life". 20
SIST EN 1999-1-1:2023/oprA1:2026
EN 1999-1-1:2023/prA1:2026 (E)
68 Modification to S.6, "Durability" . 20
69 Modifications to S.7.2, "Imperfections" . 20
70 Modification to S.8.3, "Buckling resistance of members" . 20
71 Modifications to S.9.2.2, "Road bridges" . 20
72 Modifications to S.9.2.3, "Foot bridges" . 20
73 Modifications to S.10.2, "Fatigue loading" . 20
74 Modifications to S.11.2.2, "Effects of global and local actions on decks" . 21
75 Modifications to S.11.2.3, "Surface finishing" . 22
76 Modification to S.11.2.4, "Replacement of existing decks with aluminium decks" . 22
77 Modifications to S.11.2.6, "Composite deck structures" . 23
78 Modifications to S.11.3.1, "Configurations of aluminium deep girders" . 23
79 Modification to S.11.3.2, "Detailing" . 23
80 Modifications to T.4.2, "Connection classification according to axial stiffness" . 23
81 Modifications to T.4.3, "Connection classification according to axial strength" . 23
82 Modifications to T.4.4, "Connections with bolts in shear" . 23
83 Modification to T.4.5, "Design of connections assisted by testing" . 24
84 Modifications to T.5.1, "Stability checks" . 24
85 Modifications to T.5.2, "Buckling length of members connected by gusset plates" . 24
86 Modifications to T.5.4, "Modelling of gusset plate connections subjected to axial force and
bending" . 24
87 Modification to U.1, "Use of this Annex" . 25
88 Modification to U.2, "Scope and field of application" . 25
89 Modifications to U.3, "General and main problems" . 25
90 Modification to U.4, "Calculation of Internal Forces" . 25
91 Modifications to U.4.1.1, "General" . 25
92 Modifications to U.4.1.2, "Effective width (“shear lag”)" . 25
93 Modifications to U.4.2.1, "Creep, shrinkage and cracking of concrete". 26
94 Modifications to U.4.3, "Elastic analysis with redistribution" . 26
95 Modification to U.5.1, "General" . 26
96 Modifications to U.5.2.1, "Plastic resisting moment of a composite cross section" . 26
97 Modifications to U.5.2.2, "Bending resistance of composite section from nonlinear theory"
............................................................................................................................................................................. 27
98 Modifications to U.6.1, "General rules" . 28
99 Modifications to U.6.2, "Traditional connectors" . 28
100 Deletion of U.6.3, "Innovative connectors" . 28
101 Modification to Bibliography . 28
SIST EN 1999-1-1:2023/oprA1:2026
EN 1999-1-1:2023/prA1:2026 (E)
European foreword
This document (EN 1999-1-1:2023/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 1999-1-1:2023.
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.
SIST EN 1999-1-1:2023/oprA1:2026
EN 1999-1-1:2023/prA1:2026 (E)
1 Modifications throughout the whole document
Replace references to EN 1990 with EN 1990-1.
Replace references to EN 1990:2023 with EN 1990-1:2023+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 “component” with “member” in the following clauses:
Clause/ Paragraph/ Number of Note
Subclause Figure/ Table occurrences
1.1 (1) 2
3.1.9 1
4.1.2 (2) 1
5.2.1 (1) 3 One of the occurrences is in NOTE 3
5.2.1 Table 5.2 1 The occurrence is in the title of Table 5.2
5.2.3.2 Table 5.8 1 The occurrence is in footnote a
6 (3) 1
8.1.1 (1) 1
10.5.1 (11) 2
10.9.2 (1) 1 The occurrence is in the NOTE
A.3.2 (1) 5 Three of the occurrences are in the NOTE
A.3.2 (2) 1 The occurrence is in the NOTE
A.4 (2) 2
A.4 (3) 5 All five occurrences are in NOTE 2
A.4 (4) 3 One of the occurrences is in the NOTE
A.4 (5) 2
A.5 (1) 2 One of the occurrences is in NOTE 1
B.3 (1) 1
B.6 (4) 1
C.4.1.2 (1) 1
C.4.1.3 (2) 1
C.4.2.3 (1) 1
D.5.3 (2) 2
D.5.4.8 Table D.3 2 Both occurrences are in footnote e
E.3.1 (1) 1
E.3.1 (4) 1
SIST EN 1999-1-1:2023/oprA1:2026
EN 1999-1-1:2023/prA1:2026 (E)
Clause/ Paragraph/ Number of Note
Subclause Figure/ Table occurrences
N.2 (3) 1 “component” appears two times in this
paragraph. Replace only the second
occurrence.
P.5.1 (1) 1
Q.3 (1) 1
Q.3 (2) 3
R.2 (1) 1
R.4 (9) 1
S.5.1 1 The occurrence is in title of S.5.1
S.11.2.1 (2) 1
S.11.2.2 (2) 1 The occurrence is in NOTE 1
T.4.3 (6) 1
T.4.4 (4) 1
V.2 (1) 2 Both occurrences are in NOTE 2b
2 Modifications to the Introduction
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”.
SIST EN 1999-1-1:2023/oprA1:2026
EN 1999-1-1:2023/prA1:2026 (E)
In 0.2, replace the fourth paragraph with the following:
“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.”.
3 Modification to Clause 2, "Normative references"
Replace “EN 1990, Eurocode — Basis of structural and geotechnical design”
with
“EN 1990-1, Eurocode — Basis of structural and geotechnical design — Part 1: New structures”.
4 Modifications to 3.1, "Terms and definitions"
In the definition for term 3.1.4, add “and stiffness” after “structural” and delete Notes 1 and 2 to entry.
In the definition for term 3.1.5, delete Notes 1 and 2 to entry.
5 Modifications to 3.2, "Symbols"
Replace the definition of “F ” with the following:
vp,Rd
“design value of shear resistance of the screw for loads within -120° ≤ θ ≤ -60° (opposite the opening of
the groove)”.
Delete “L” and definition.
Delete “h” and definition.
Delete “u-u” and definition.
Delete “v-v” and definition.
Replace “β , β , β ” with “β , β ”.
1 2 3 2 3
Delete “δ ” and definition.
q
Replace “λ ” with “λ ”.
c1, c,l
Add “, correction factor” after “slip factor, efficiency factor” in the definition of “μ”.
Replace “ρ ” with “ρ ”.
c,1 c,l
Delete “σ ” and definition.
cr
Delete “σ ” and definition.
cr0
6 Modification to 5.2.2, "Material properties for wrought and casting alloys"
Replace “should” with “shall” in footnote c in Table 5.4.
SIST EN 1999-1-1:2023/oprA1:2026
EN 1999-1-1:2023/prA1:2026 (E)
7 Modification to 5.2.5, "Design values of material constants"
Replace “α” with “α ” in the fourth bullet point in (1).
T
8 Modification to 7.1.2, "Joint modelling "
Replace the second and third bullet points in (2) with the following:
“
— For semi-continuous joint model, the structural and stiffness properties of the joint components
need explicit consideration for its modelling in the global analysis;
— For continuous joint model, only the structural properties of the members need to be considered in
the global analysis.”.
9 Modification to 7.2.2, "Structural stability of frames"
Replace “lateral” with “torsional” in the second to last sentence in (6).
10 Modification to 7.3.2, "Imperfections for global analysis of frames"
λ
Replace “Note 2” with “Note 4” in the definition of “ ” in the key to Formula (7.7).
m
11 Modification to 8.1.4.3, "Slenderness parameters"
Add “stiffeners” at the end of the definition of “a” in the key to Figure 8.4.
12 Modifications to 8.1.4.4, "Classification of cross-section parts"
Add the following after (1) and renumber the following paragraph:
“(2) In Table 8.1 and Table 8.2, a cross-section part should be considered with welds if it contains
longitudinal welding at an edge or at any point within its width. Cross-s
...