EN 1993-1-3:2024/prA1

Eurocode 3 - Design of steel structures - Part 1-3: Cold-formed members and sheeting

1.1   Scope of prEN 1993-1-3
(1) This document provides rules for structural design of cold-formed steel members and sheeting.
(2) This document applies to cold-formed steel products made from coated or uncoated hot- or cold-rolled sheet or strip, which have been cold-formed by processes such as roll-forming or press braking. It also covers sheeting and members which are curved during fabrication by continuous bending or roll-forming. Sheeting which has the curvature created by crushing the inner flanges is not included. This document is also applicable to the design of profiled steel sheeting for composite steel and concrete slabs at the construction stage, see EN 1994. The execution of steel structures made of cold-formed steel members and sheeting is covered in EN 1090 4. Provisions for bolted connections are provided in EN 1090 2.
NOTE   The rules in prEN 1993 1 3 complement the rules in other parts of EN 1993 1.
(3) Methods are also given for stressed-skin design, using steel sheeting as a structural diaphragm.
(4) This document does not apply to cold-formed circular and rectangular structural hollow sections supplied to EN 10219, for which reference is made to EN 1993 1 1 and EN 1993 1 8.
(5) This document provides methods for design by calculation and for design assisted by testing. The methods for design by calculation apply only within the stated ranges of material properties and geometric proportions, for which sufficient experience and test evidence is available. These limitations do not apply to design assisted by testing.
1.2   Assumptions
(1) Unless specifically stated, EN 1990, EN 1991 (all parts) and EN 1993 1 1 apply.
(2) The design methods given in prEN 1993 1 3 are applicable if:
-   the execution quality is as specified in EN 1090 4, the execution quality of bolted connections is as specified in EN 1090 2, and
-   the construction materials and products are as specified in the relevant parts of EN 1993 (all parts), or in the relevant material and product specifications.
(2) EN 1993 is intended to be used in conjunction with:
-   the parts of EN 1992 to EN 1999 where steel structures or steel components are referred to within those documents;
-   EN, EAD and ETA standards for construction products relevant to steel structures.

Eurocode 3 - Bemessung und Konstruktion von Stahlbauten - Teil 1-3: Kaltgeformte Bauteile und Profiltafeln

Eurocode 3 - Calcul des structures en acier - Partie 1-3: Règles générales - Profilés et plaques formés à froid

Evrokod 3 - Projektiranje jeklenih konstrukcij - 1-3. del: Hladno oblikovani profili in pločevina

1.1 Področje uporabe prEN 1993-1-3
(1) Ta dokument določa pravila za projektiranje konstrukcij iz hladno oblikovanih jeklenih elementov in pločevin.
(2) Ta dokument se uporablja za hladno oblikovane jeklene izdelke, izdelane iz prevlečenih ali neprevlečenih vroče ali hladno valjanih pločevin ali trakov, ki so bili hladno oblikovani s postopki, kot so profiliranje ali upogibanje s stiskalnico. Prav tako zajema pločevine in elemente, ki so ukrivljeni med izdelavo s kontinuiranim upogibanjem ali profiliranjem. Pločevine, katerih ukrivljenost je ustvarjena z drobljenjem notranjih robov, niso vključene. Ta dokument je prav tako uporaben za projektiranje profilirane jeklene pločevine za sestavljene jeklene in betonske plošče v fazi gradnje, glej EN 1994. Izvedba jeklenih konstrukcij iz hladno oblikovanih jeklenih elementov in pločevin je zajeta v EN 1090 4. Določila za vijačne spoje so podana v EN 1090 2.
OPOMBA Pravila v prEN 1993 1 3 dopolnjujejo pravila v drugih delih EN 1993 1.
(3) Podani so tudi postopki za projektiranje z napetostno membrano, z uporabo jeklene pločevine kot konstrukcijskega diafragme.
(4) Ta dokument se ne uporablja za hladno oblikovane krožne in pravokotne konstrukcijske votle profile, dobavljene po EN 10219, za katere se sklicuje na EN 1993 1 1 in EN 1993 1 8.
(5) Ta dokument zagotavlja metode za projektiranje z izračunom in za projektiranje s pomočjo preskušanja. Metode za projektiranje z izračunom veljajo le znotraj navedenih razponov lastnosti materiala in geometrijskih razmerij, za katere so na voljo zadostne izkušnje in dokazila iz preskusov. Te omejitve ne veljajo za projektiranje s pomočjo preskušanja.
1.2 Predpostavke
(1) Če ni posebej navedeno, veljajo EN 1990, EN 1991 (vsi deli) in EN 1993 1 1.
(2) Metode projektiranja, podane v prEN 1993 1 3, so uporabne, če:
- kakovost izvedbe je določena v EN 1090 4, kakovost izvedbe vijačnih spojev je določena v EN 1090 2, in
- gradbeni materiali in izdelki so določeni v ustreznih delih EN 1993 (vsi deli) ali v ustreznih specifikacijah materialov in izdelkov.
(2) EN 1993 je namenjen uporabi v povezavi z:
- deli EN 1992 do EN 1999, kjer so jeklene konstrukcije ali jekleni sestavni deli omenjeni v teh dokumentih;
- standardi EN, EAD in ETA za gradbene izdelke, ki so pomembni za jeklene konstrukcije.

General Information

• Status: Not Published
• Publication Date: 18-May-2027
• ICS: 91.080.13 - Steel structures
• Technical Committee: CEN/TC 250 - Structural Eurocodes
• Drafting Committee: CEN/TC 250/SC 3/WG 3 - Evolution of EN 1993-1-3 - Cold-formed members
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 26-Mar-2026
• Due Date: 17-Feb-2026
• Completion Date: 26-Mar-2026
• Ref Project: SIST EN 1993-1-3:2024/oprA1:2026 - Eurocode 3 - Design of steel structures - Part 1-3: Cold-formed members and sheeting

Relations

• Amends: EN 1993-1-3:2024 - Eurocode 3 - Design of steel structures - Part 1-3: Cold-formed members and sheeting
• Effective Date: 17-Sep-2025

Overview

EN 1993-1-3:2024/prA1, part of the Eurocode 3 suite, provides comprehensive provisions for the structural design of cold-formed steel members and sheeting. Published by CEN, this draft amendment targets the safe and efficient use of cold-formed steel in construction, addressing both coated and uncoated products fabricated by roll-forming, press braking, or continuous bending. The scope also includes members that are curved during fabrication, as well as structural use of profiled steel sheeting in composite steel and concrete slabs, particularly at the construction stage.

EN 1993-1-3:2024/prA1 is intended for use alongside other Eurocode standards and relevant product and material specifications. It complements the general rules presented in EN 1993-1-1, focusing on unique requirements and additional criteria specific to cold-formed products.

Key Topics

• Scope of Application: Covers cold-formed steel members, profiled sheeting, and curved elements, excluding circular and rectangular hollow sections specified by EN 10219.
• Material Specifications: Encompasses hot-rolled and cold-rolled structural steel, thermomechanically rolled steels, micro-alloyed high-yield products, and various coated steels. Specific requirements for ductility and strength are outlined, referencing related EN and ISO standards.
• Design Approaches: Offers methods for both design by calculation and design assisted by testing. Calculation methods are restricted to defined material property ranges supported by evidence; testing allows for broader application.
• Connection Design: Outlines provisions for bolted connections and relevant fastener durability, with cross-reference to EN 1090-2 and Annex B for corrosion environments.
• Structural Analysis: Details technical and editorial improvements concerning structural limits, cross-section classification, buckling resistance, and interaction formulae for ultimate limit states.
• Special Configurations: Includes guidelines for unique member types, liner trays, and sheeting arrangements, as well as design provisions for openings and fastening systems.
• Testing and Quality Assurance: Specifies procedures and criteria for material, component, and system testing, ensuring compliance and performance validation.

Applications

This standard is crucial in the design and execution of steel buildings, industrial facilities, warehouses, roofing, cladding systems, and composite structures where cold-formed steel products are essential for lightweight, efficient construction. Key advantages include:

• Optimized Material Usage: Enables thin-walled steel elements to be used safely, reducing overall material consumption and weight without compromising structural performance.
• Versatile Construction: Facilitates the use of custom-shaped and curved steel components, enabling complex architectural designs and efficient prefabrication.
• Composite Construction: Supports the integration of profiled steel sheeting in composite floor and roof systems, enhancing load-bearing capacity and speeding up construction.
• Quality Assurance: Through its links to EN 1090 and other standards, the document ensures traceable quality and dependable long-term performance of steel elements in various environments.

Related Standards

For effective implementation, EN 1993-1-3:2024/prA1 is designed for use in conjunction with a suite of supporting standards, including:

• EN 1993-1-1: General rules for the design of steel structures
• EN 1994: Composite steel and concrete structures
• EN 1090-2 / EN 1090-4: Execution of steel structures and cold-formed members
• EN 10219: Hollow sections
• EN 1990 & EN 1991: Basis of structural design and loading
• ISO 2566: Ductility and elongation conversion
• EN 1992 - EN 1999: Where steel is referenced in other Eurocodes
• ECCS No. 146:2025: Direct Strength Method for cold-formed members

By aligning with these related standards, EN 1993-1-3 ensures seamless integration in steel structure design and promotes pan-European consistency and safety.

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Keywords: EN 1993-1-3, Eurocode 3, cold-formed steel, structural design, steel sheeting, profiled members, CEN standards, composite structures, steel construction, material specifications, connection design, testing procedures, corrosion resistance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Evrokod 3 - Projektiranje jeklenih konstrukcij - 1-3. del: Hladno oblikovani profili in
pločevina
Eurocode 3 - Design of steel structures - Part 1-3: Cold-formed members and sheeting
Eurocode 3 - Bemessung und Konstruktion von Stahlbauten - Teil 1-3: Kaltgeformte
Bauteile und Profiltafeln
Eurocode 3 - Calcul des structures en acier - Partie 1-3: Règles générales - Profilés et
plaques formés à froid
Ta slovenski standard je istoveten z: EN 1993-1-3:2024/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 1993-1-3:2024
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
March 2026
ICS
English Version
Eurocode 3 - Design of steel structures - Part 1-3: Cold-
formed members and sheeting
Eurocode 3 - Calcul des structures en acier - Partie 1-3: Eurocode 3 - Bemessung und Konstruktion von
Règles générales - Profilés et plaques formés à froid Stahlbauten - Teil 1-3: Kaltgeformte Bauteile und
Profiltafeln
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 1993-1-3:2024. 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 1993-1-3:2024/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 3, “Terms and definitions” . 5
4 Modification to Clause 5, “Materials” . 6
5 Modification to Clause 7, “Structural analysis” . 8
5.1 Technical modifications . 8
5.2 Editorial modifications . 9
6 Modification to Clause 8, “Ultimate limit states” . 9
7 Modifications to Clause 10, “Design of joints” . 11
8 Modifications to Clause 11, “Special configurations for members, liner trays and
sheeting” . 11
8.1 Technical modifications . 11
9 Modifications to Annex A, “Testing procedures” . 15
10 Modifications to Annex B, “Durability of fasteners” . 16
11 Modifications to Bibliography . 18

European foreword
This document (EN 1993-1-3:2024/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 1993-1-3:2024.
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 “FprCEN/TR 1993-1-102” 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 structural glass”
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 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).

3 Modification to Clause 3, “Terms and definitions”
3.1.6.13 Add new term and definition as follows:
“
3.1.6.13
pull-through resistance
failure mode of fastenings in which the fastened component I (for bolt fastenings it also applies to
component II) is pulled over the head of the fastener (for bolt fastenings it also applies to the nut) and, if
present, over the washer; often accompanied with large deformations and tearing of the component
”.
3.1.6.14 Add new term and definition as follows:
“
3.1.6.14
ull-out resistance
failure mode of fastenings in which the fastener is pulled out of component II; in threaded fastenings
accompanied with stripping of the threads of the fastener and/or of component II (supporting structure)
".
3.2.1 Delete the index “c” and add index “,com” in the definition for Mlt,c,Rd to read: “Mlt,Rd,com“.
3.2.1 Delete the index “t” and add index “,ten” in the definition for M to read: “M ”.
lt,t,Rd lt,Rd,ten
3.1.1.3 Add “of the sheet” in the definition for the nominal thickness to read: “nominal thickness
target average thickness of the sheet after cold-forming specified by the steel supplier, inclusive
of zinc and other metallic coating layers, but not including organic coatings”.
3.1.1.4 Add “of the the sheet” in the definition for the steel core thickness to read: “steel core thickness
nominal thickness of the sheet minus zinc and other metallic coating layers”.
3.1.4.1 Add “of the the sheet” in the definition for the design thickness to read: “design thickness
steel thickness of the sheet used in design by calculation, according to 3.3.3(6) and 5.2.4”.
3.2.2 Delete “sheet” in the definition for t to read: “t nominal thickness after cold-forming,
nom nom
inclusive of zinc and other metallic coatings, but not including any organic coatings”.
3.2.2 Replace “z ” with “z “.
c com
3.2.2 Replace “z “with “z “.
t ten
3.2.2 Replace “y-coordinate” with “z-coordinate“ in the definition for the shear centre coordinate z to read:
“z-coordinate of the shear centre relative to the centroid of the gross cross-section”.
4 Modification to Clause 5, “Materials”
5.1(1) Add a NOTE after the second paragraph within (1): “NOTE EN ISO 2566 provides information
for converting of elongation at failure for non-proportional gauge lengths 80 mm or 50 mm to elongation
at failure for proportional gauge lengths 5,65 sqrt[S ] required for assessment of ductility criteria given
in EN 1993-1-1.”
5.1(1), Table 5.1:
— Delete “non-alloy” in the designation of the standard EN 10025-2 for Table 5.1 to read: “Hot-rolled
products of structural steels — Part 2: Technical delivery conditions for non-alloy structural
steels”
— Add steel grades S500M and S55ML according to EN 10025-4 and the corresponding basic yield
strength f and ultimate tensile strength f for Table 5.1 to read:
yb u
“Table 5.1 — Nominal values of basic yield strength f and ultimate tensile strength f
yb u
fyb fu
Type of steel Standard Grade
2 2
[N/mm ] [N/mm ]
Hot-rolled products of structural EN 10025-2 S 235 235 360
steels — Part 2: Technical delivery
S 275 275 390
conditions for non-alloy structural
S 355 355 490
steels
S 460 460 540
Hot-rolled products of structural EN 10025-3 S 275 N 275 370
steels — Part 3: Technical delivery
S 355 N 355 470
conditions for normalized/
S 420 N 420 520
normalized rolled weldable fine grain
structural steels S 460 N 460 540
S 275 NL 275 370
S 355 NL 355 470
S 420 NL 420 520
S 460 NL 460 540
Hot-rolled products of structural EN 10025-4 S 275 M 275 360
steels — Part 4: Technical delivery
S 355 M 355 450
conditions for thermomechanical
S 420 M 420 500
rolled weldable fine grain structural
steels S 460 M 460 530
S 500 M 500 580
S 275 ML 275 360
S 355 ML 355 450
S 420 ML 420 500
S 460 ML 460 530
S 500 ML 500 580
“
5.1(4), Table 5.2:
— Add steel grades “HC460LA and HC500LA” according to EN 10268 and the corresponding basic
and ultimate tensile strengths f ;
yield strengths fyb u
— add steel grade “S550GD+Z, +ZF, +ZA, +ZM, +AZ” according to EN 10346 and the corresponding
c
basic yield strength f , ultimate tensile strength f and reference to footnote “ ”;
yb u
c d d
— change footnote “ ” to “ ” and replace the definition with “ The product standard does not
specify a minimum value of the yield strength. A minimum yield strength of 120 N/mm may be
assumed “;
c c
— add a new footnote “ “and its definition as follows: “ Cold-formed members and sheeting made
of this steel grade shall only be used when specified from a test-based design according to clause
11 and Annex A.”;
c
— delete the references to footnote “ ” for steel grades HX500LAD+Z, +ZF, +ZA, +ZM, +AZ, +AS,
DX51D+Z, +ZF, +ZA, +ZM, +AZ, +AS, DX52D+Z, +ZF, +ZA, +ZM, +AZ, +AS and DX53D+Z, +ZF,
+ZA, +ZM, +AZ, +AS in the table;
d
— add the reference to footnote “ ” for steel grade DX51D+Z, +ZF, +ZA, +ZM, +AZ, +AS in the table
for Table 5.2 to read:
“Table 5.2 — Nominal values of basic yield strength f and ultimate tensile strength f
yb u
f f
yb u
Type of steel Standard Grade
2 2
[N/mm ] [N/mm ]
Cold-reduced carbon steel ISO 4997 CR 220 220 300
sheet of structural quality
CR 250 250 330
CR 320 320 400
Hot-rolled flat products made EN 10149-2 S 315 MC 315 390
of high yield strength steels
S 355 MC 355 430
for cold-forming — Part 2:
S 420 MC 420 480
Technical delivery conditions
for thermomechanically rolled S 460 MC 460 520
steels
S 500 MC 500 550
S 550 MC 550 600
S 600 MC 600 650
b
S 650 MC 650 700
b
S 700 MC 700 750
a a
Hot-rolled flat products made EN 10149-3 S 260 NC 240 350
of high yield strength steels
a a
S 315 NC 295 410
for cold-forming — Part 3:
a a
S 355 NC 355 450
Technical delivery conditions
a a
S 420 NC 400 510
for normalized or normalized
rolled steels
Cold-rolled flat products made EN 10268 HC260LA 240 340
of high yield strength micro-
HC300LA 280 370
alloyed steels for cold-forming
HC340LA 320 400
HC380LA 350 430
HC420LA 390 460
HC460LA 420 480
HC500LA 460 520
fyb fu
Type of steel Standard Grade
2 2
[N/mm ] [N/mm ]
Continuously hot-dip coated EN 10346 S220GD+Z, +ZF, +ZA, +ZM, +AZ 220 300
steel flat products for cold-
S250GD+ Z, +ZF, +ZA, +ZM, +AZ, +AS 250 330
forming
...