EN 1993-1-1:2022/prA1

Eurocode 3 - Design of steel structures - Part 1-1: General rules and rules for buildings

(1) EN 1993-1-1 gives basic design rules for steel structures using all steel grades from S235 up to and including S700 unless otherwise stated in individual clauses.
(2) It also gives supplementary provisions for the structural design of steel buildings. These supplementary provisions are indicated by the letter “B” after the paragraph number, thus ( )B.

Eurocode 3 - Bemessung und Konstruktion von Stahlbauten - Teil 1-1: Allgemeine Bemessungsregeln und Regeln für den Hochbau

Eurocode 3 - Calcul des structures en acier - Partie 1-1 : Règles générales et règles pour les bâtiments

Evrokod 3 - Projektiranje jeklenih konstrukcij - 1-1. del: Splošna pravila in pravila za stavbe

(1) EN 1993-1-1 podaja osnovna pravila za projektiranje jeklenih konstrukcij z uporabo vseh vrst jekla od S235 do vključno S700, razen če ni v posameznih členih navedeno drugače.
(2) Prav tako podaja dopolnilne določbe za projektiranje jeklenih stavb. Te dopolnilne določbe so označene s črko "B" za številko odstavka, torej ( )B.

General Information

• Status: Not Published
• Publication Date: 27-Apr-2027
• ICS: 91.010.30 - Technical aspects
• Technical Committee: CEN/TC 250 - Structural Eurocodes
• Drafting Committee: CEN/TC 250/SC 3/WG 1 - Evolution of EN 1993-1-1 - General rules for buildings
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 26-Mar-2026
• Due Date: 27-Jan-2026
• Completion Date: 26-Mar-2026
• Ref Project: SIST EN 1993-1-1:2022/oprA1:2026 - Eurocode 3 - Design of steel structures - Part 1-1: General rules and rules for buildings

Relations

• Amends: EN 1993-1-1:2022 - Eurocode 3 - Design of steel structures - Part 1-1: General rules and rules for buildings
• Effective Date: 03-Sep-2025

Overview

EN 1993-1-1:2022/prA1, known as Eurocode 3: Design of Steel Structures – Part 1-1: General rules and rules for buildings, is a pivotal standard developed by CEN for structural steel design across Europe. This draft amendment updates the core Eurocode for steel structures, harmonizing design practices for steel grades from S235 up to S700, unless specified otherwise in detailed clauses. Applicable to the design of steel buildings, it introduces supplementary provisions tailored for the construction sector, helping structural engineers standardize their approach to safety, durability, and efficiency.

Key Topics

This amendment covers essential modifications for practitioners and organizations involved in steel structure design and construction:

• Scope and Applicability: Outlines fundamental rules for designing steel structures using a wide range of steel grades and includes requirements for integration with other Eurocode documents and standards relevant to execution, testing, and construction products.
• Updated Terminology and Definitions: Refines terms and includes new symbols for critical properties such as tensile stress area and moments of inertia, ensuring precise communication and calculation.
• Materials and Durability: Strengthens guidance on corrosion protection and execution of protective treatments, referencing EN ISO 12944, EN ISO 1461, and related standards for coatings and material selection.
• Structural Analysis: Introduces clarified procedures for evaluating lateral torsional buckling, member imperfections, and allowable methods for ultimate limit state checks, enhancing analysis rigor.
• Ultimate Limit States: Revises buckling curve selection, imperfection factors, and formulas affecting axial and flexural buckling, supporting accurate member verification.
• National Choices and Flexibility: Highlights areas subject to national annexes, allowing adaptation to specific regulatory and safety requirements across European countries.

Applications

EN 1993-1-1:2022/prA1 is widely applicable in:

• Building Design: Used by structural engineers and architects in the design and analysis of all types of steel buildings, from commercial and industrial projects to residential high-rises.
• Component Specification: Guides the specification of steel sections, connections, and assemblies, addressing requirements for joints, loaded members, and built-up sections.
• Compliance and Quality Assurance: Provides a harmonized framework for meeting European design and safety regulations, supporting procurement, fabrication, and inspection processes.
• Integration with Other Standards: The standard is intended for use with other Eurocodes (e.g., EN 1990-1 for design basis, EN 1992 to EN 1999 for material and product standards), ensuring comprehensive coverage from conceptual design to execution.
• National and International Projects: With standardized rules and recognized supplementary provisions, the standard facilitates cross-border construction projects and supports international collaboration.

Related Standards

EN 1993-1-1:2022/prA1 is closely linked with several standards for a holistic approach to steel structure design:

• EN 1990-1 – Basis of structural and geotechnical design
• EN 1993-1-2 to EN 1993-1-14 – Covering specialized aspects: fire design, cold-formed and stainless sections, joints, material toughness, and finite element analysis
• EN 1993-2 to EN 1993-7 – Application to bridges, towers, masts, silos, tanks, crane supports, and sandwich panels
• EN 1090-2, EN 1090-4 – Execution standards for steel structures
• CEN/TS 17991 – Statistical verification of partial factors for buildings
• EN ISO 12944, EN ISO 1461 – Surface protection and hot-dip galvanizing
• EN 10025-5 – Weathering steel requirements

By implementing EN 1993-1-1:2022/prA1, engineers and organizations strengthen the reliability, safety, and sustainability of steel structures in line with the latest European best practices.

Keywords: EN 1993-1-1, Eurocode 3, steel structures, design standards, steel grades, structural analysis, durability, buckling, construction standards, CEN, building regulations.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Evrokod 3 - Projektiranje jeklenih konstrukcij - 1-1. del: Splošna pravila in pravila
za stavbe
Eurocode 3 - Design of steel structures - Part 1-1: General rules and rules for buildings
Eurocode 3 - Bemessung und Konstruktion von Stahlbauten - Teil 1-1: Allgemeine
Bemessungsregeln und Regeln für den Hochbau
Eurocode 3 - Calcul des structures en acier - Partie 1-1 : Règles générales et règles
pour les bâtiments
Ta slovenski standard je istoveten z: EN 1993-1-1:2022/prA1
ICS:
91.010.30 Tehnični vidiki Technical aspects
91.080.13 Jeklene konstrukcije Steel structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 1993-1-1:2022
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
March 2026
ICS
English Version
Eurocode 3 - Design of steel structures - Part 1-1: General
rules and rules for buildings
Eurocode 3 - Calcul des structures en acier - Partie 1-1 : Eurocode 3 - Bemessung und Konstruktion von
Règles générales et règles pour les bâtiments Stahlbauten - Teil 1-1: Allgemeine Bemessungsregeln
und Regeln für den Hochbau
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 1993-1-1:2022. 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 1993-1-1:2022/prA1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modifications throughout the whole document . 4
2 Modification to Introduction . 4
3 Modification to Clause 1, "Scope" . 5
4 Modification to Clause 2, "Normative References" . 5
5 Modification to Clause 3, "Terms and definitions" . 5
6 Modification to Clause 4, "Bases of Design" . 7
7 Modification to Clause 6, "Durability" . 7
8 Modification to Clause 7, "Structural analysis" . 7
9 Modification to Clause 8, " Ultimate limit states" . 9
10 Modification to Annex B . 16
11 Modification to Annex C . 16
12 Modification to Annex E . 16
13 Modification to Bibliography . 17

European foreword
This document (EN 1993-1-1:2022/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 1993-1-1:2022.
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 recognise 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.
1 Modifications throughout the whole document
Add “-1:2023+A1:2026” to the reference “EN 1990” in clause 2 and update throughout the text when a
dated reference is given.
Add part number “-1” to the reference “EN 1990” and update throughout the text when an undated reference
is given.
Replace the number of the CEN/TR “prCEN/TR 1993-1-103” with “prCEN/TR 1993-1-102” throughout the
text.
Replace “St. Venant” with “Saint-Venant” throughout the text.
2 Modification to Introduction
0.1 Replace “— New parts are under development, e.g. Eurocode for design of structural glass”
with “— EN 19100 Eurocode 10 — Design of glass structures”
0.1 Add the following new list item: “— New parts are under development, e.g. Eurocode for design of
fibre-polymer composite structures and for design of tensioned membrane structures”
0.2 Replace in the first paragraph the reference to EN 1990 with “EN 1990-1 — Basis of structural and
geotechnical design — Part 1: New structures”.
0.2 Replace the list of the various parts of EN 1993 with:
EN 1993-1-1, Eurocode 3 — Design of Steel Structures — Part 1-1: General rules and rules for buildings;
EN 1993-1-2, Eurocode 3 — Design of Steel Structures — Part 1-2: Structural fire design;
EN 1993-1-3, Eurocode 3 — Design of Steel Structures — Part 1-3: Cold-formed members and sheeting;
NOTE Cold-formed hollow sections supplied according to EN 10219 (all parts) are covered in EN 1993-1-1.
EN 1993-1-4, Eurocode 3 — Design of Steel Structures — Part 1-4: Stainless steel structures;
EN 1993-1-5, Eurocode 3 — Design of Steel Structures — Part 1-5: Plated structural elements;
EN 1993-1-6, Eurocode 3 — Design of Steel Structures — Part 1-6: Strength and stability of shell structures;
EN 1993-1-7, Eurocode 3 — Design of Steel Structures — Part 1-7: Plate assemblies with elements under
transverse loads;
EN 1993-1-8, Eurocode 3 — Design of Steel Structures — Part 1-8: Joints;
EN 1993-1-9, Eurocode 3 — Design of Steel Structures — Part 1-9: Fatigue;
EN 1993-1-10, Eurocode 3 — Design of Steel Structures — Part 1-10: Material toughness and through-
thickness properties;
EN 1993-1-11, Eurocode 3 — Design of Steel Structures — Part 1-11: Tension components;
EN 1993-1-12, Eurocode 3 — Design of Steel Structures — Part 1-12: Additional rules for steel grades up to
S960;
EN 1993-1-13, Eurocode 3 — Design of Steel Structures — Part 1-13: Beams with large web openings;
EN 1993-1-14, Eurocode 3 — Design of Steel Structures — Part 1-14: Design assisted by finite element
analysis;
EN 1993-2, Eurocode 3 — Design of Steel Structures — Part 2: Bridges;
EN 1993-3, Eurocode 3 — Design of Steel Structures — Part 3: Towers, masts and chimneys;
EN 1993-4-1, Eurocode 3 — Design of Steel Structures — Part 4-1: Silos;
EN 1993-4-2, Eurocode 3 — Design of Steel Structures — Part 4-2: Tanks;
EN 1993-5, Eurocode 3 — Design of Steel Structures — Part 5: Piling;
EN 1993-6, Eurocode 3 — Design of Steel Structures — Part 6: Crane supporting structures;
EN 1993-7, Eurocode 3 — Design of Steel Structures — Part 7: Sandwich panels (under preparation).”

0.5 Add “notes to” between “through” and “the following clauses” in 0.5.
0.5 In the list of national choices remove all spaces between clause-number and paragraph. For example,
replace: “4.4.3 (2)” with “4.3.3(2)”.
0.5 In the list of paragraphs for which a national choice is allowed, replace "7.2.2(10)" with “7.2.2(9)”.
0.5 In the fifth paragraph in the list of paragraphs for which a national choice is allowed, add “10.3”.
0.5 Replace in the sixth paragraph (under the list of NDPs) the word "annexes" by "annex".

3 Modification to Clause 1, "Scope"
1.1 Replace the whole of paragraph (1) with:
“(1) EN 1993-1-1 gives basic design rules for steel structures using all steel grades from S235 up to and
including S700 unless otherwise stated in individual clauses.”
1.2(2) Replace the whole of paragraph 1.2(2) with:
"(2) EN 1993 is intended to be used in conjunction with EN 1990-1, EN 1991 (all parts), the parts of
EN 1992 to EN 1999 where steel structures or steel components are referred to within those documents,
EN 1090-2, EN 1090-4 and ENs for construction products relevant to steel structures."
4 Modification to Clause 2, "Normative References"
Replace the reference to EN 1990 by:
EN 1990-1:2023+A1:2026, Eurocode — Basis of structural and geotechnical design — Part 1: New
structures
5 Modification to Clause 3, "Terms and definitions"
3.2.1 Add symbol and definition: “𝐴𝐴 tensile stress area of a bolt”
s
3.2.1 Add symbol and definition: “𝐼𝐼 moment of inertia of the effective part of a packing plate”
pp
3.2.1 Add symbol and definition: “𝐼𝐼 moment of inertia of the individual angle section about its v-v axis”
v,ch
3.2.1 Replace the definition for 𝑀𝑀 with the following: “design value of the lateral torsional buckling
b,Rd
resistance”
3.2.1 Replace in the definition for 𝑀𝑀 “sign” with “design”
N,Rd
3.2.1 Replace the definition for 𝑁𝑁 with the following: “design value of the axial force”
Ed
3.2.1 Replace the definition for 𝑁𝑁 with the following: “design value of the axial force in the compressed
f,Ed
flange of a stabilized member at a plastic hinge location”
3.2.1 Change letter ‘m’ to italic ‘m’ in the following symbol definitions to
"
𝐸𝐸𝐼𝐼�𝜂𝜂 �
𝑐𝑐𝑐𝑐,𝑚𝑚
M
Rk,m
N
cr,m
N
Ed,m
N
Rk,m
3.2.2 Replace the definition for 𝑎𝑎 with the following: “ratio of section area of the smaller sides to gross
f
section area for rectangular hollow sections or ratio of section area of the flanges to gross section area
for welded box sections”
3.2.2 Replace the definition for 𝑎𝑎 with the following: “ratio of section area of the larger sides to gross
w
section area for rectangular hollow sections or ratio of section area of the webs to gross section area for
welded box sections”
3.2.2 Replace the definition for 𝑒𝑒 with the following: “amplitude of the equivalent bow imperfection”
3.2.2 Replace the definition for 𝑒𝑒 with the following: “amplitude of the equivalent bow imperfection for
0,LT
lateral torsional buckling”
3.2.2 Replace the definition for 𝑒𝑒 with the following: “amplitude of the equivalent bow imperfection at
0,m
the critical cross-section m”
3.2.2 Replace the definition for 𝑖𝑖 with the following: “minimum radius of gyration of a single angle
min
section”
3.2.2 Delete full stop at end of symbol definition n
3.2.2 Replace the definition for 𝑠𝑠 with the following: “𝑠𝑠 staggered pitch, the spacing of the centres of two
consecutive holes in the chain measured parallel to the member axis”
3.2.2 Add symbol and definition: “𝑠𝑠 width across flats of a bolt head”
b
3.2.2 Add symbol and definition: “𝑡𝑡 thickness of a packing plate”
p
with the following: “additional moment about y-y axis due to the
3.2.3 Replace the definition for ΔMy,Ed
shift of the centroid in the direction of the z-z axis”
3.2.3 Replace the definition for ΔM with the following: “additional moment about z-z axis due to the shift
z,Ed
of the centroid in the direction of the y-y axis”
̅
3.2.4 Replace the definition for 𝜆𝜆 with the following: “relative slenderness related to the critical section
m
m”
3.2.4 Add symbol and definition: “𝜆𝜆̅ relative slenderness considering the effects of the flexural stiffness
V
and the shear stiffness”
3.2.4 Replace the definition for α with the following: “exponent in biaxial interaction formula relating to
y
moment about the y-y axis”
3.2.4 Replace the definition for α with the following: “exponent in biaxial interaction formula relating to
z
moment about the z-z axis”
3.2.4 Replace the definition for β with the following: “reference relative amplitude of bow imperfection”
3.2.4 Replace the definition for β with the following: “reference relative amplitude of bow imperfection
LT
for lateral torsional buckling”
3.2.4 Replace in the definition for ρ “forces” with “force”
3.2.4 Change letter ‘m’ to italic ‘m’ in symbol definition of 𝛼𝛼
η,m
6 Modification to Clause 4, "Bases
...