SIST EN 1999-1-5:2023/oprA1:2026

Eurocode 9 - Design of aluminium structures - Part 1-5: Shell structures

1.1   Scope of EN 1999-1-5
(1)   EN 1999-1-5 applies to the structural design of aluminium structures, stiffened and unstiffened, that have the form of a shell of revolution or of a round panel in monocoque structures.
(2)   EN 1999-1-5 covers additional provisions to those given in the relevant parts of EN 1999 for design of aluminium structures.
NOTE   Supplementary information for certain types of shells is given in EN 1993-1-6 and the relevant application parts of EN 1993 which include:
-   Part 3-1 for towers and masts;
-   Part 3-2 for chimneys;
-   Part 4-1 for silos;
-   Part 4-2 for tanks;
-   Part 4-3 for pipelines.
(4)   The provisions in EN 1999-1-5 apply to axisymmetric shells (cylinders, cones, spheres) and associated circular or annular plates, beam section rings and stringer stiffeners, where they form part of the complete structure.
(5)   Single shell panels (cylindrical, conical or spherical) are not explicitly covered by EN 1999-1-5. However, the provisions can be applicable if the appropriate boundary conditions are duly taken into account.
(6)   Types of shell walls covered in EN 1999-1-5 can be (see Figure 1.1):
-   shell wall constructed from flat rolled sheet with adjacent plates connected with butt welds, termed “isotropic”;
-   shell wall with lap joints formed by connecting adjacent plates with overlapping sections, termed “lap-jointed”;
-   shell wall with stiffeners attached to the outside, termed “externally stiffened” irrespective of the spacing of stiffeners;
-   shell wall with the corrugations running up the meridian, termed “axially corrugated”;
-   shell wall constructed from corrugated sheets with the corrugations running around the shell circumference, termed “circumferentially corrugated”.
[Figure 1.1 - Illustration of cylindrical shell form]
(7)   The provisions of EN 1999-1-5 are intended to be applied within the temperature range defined in EN 1999-1-1. The maximum temperature is restricted so that the influence of creep can be neglected. For structures subject to elevated temperatures associated with fire, see EN 1999-1-2.
(8)   EN 1999-1-5 does not cover the aspect of leakage.
1.2   Assumptions
(1)   The general assumptions of EN 1990 apply.
(2)   The provisions of EN 1999-1-1 apply.
(3)   The design procedures are valid only when the requirements for execution in EN 1090-3 or other equivalent requirements are complied with.
(4)   EN 1999 is intended to be used in conjunction with:
-   European Standards for construction products relevant for aluminium structures;
-   EN 1090-1, Execution of steel structures and aluminium structures - Part 1: Requirements for conformity assessment of structural components;
-   EN 1090-3, Execution of steel structures and aluminium structures - Part 3: Technical requirements for aluminium structures.

Eurocode 9 - Bemessung und Konstruktion von Aluminiumtragwerken - Teil 1-5: Schalentragwerke

Eurocode 9 - Calcul des structures en aluminium - Partie 1-5 : Coques

Evrokod 9 - Projektiranje konstrukcij iz aluminijevih zlitin - 1-5. del: Lupinaste konstrukcije

1.1 Področje uporabe EN 1999-1-5  
(1) EN 1999-1-5 se uporablja za projektiranje aluminijastih konstrukcij, ojačanih in neojačanih, ki imajo obliko rotacijske lupine ali okroglega panela v monokok konstrukcijah.  
(2) EN 1999-1-5 zajema dodatne določbe k tistim, ki so podane v ustreznih delih EN 1999 za projektiranje aluminijastih konstrukcij.  
OPOMBA Dopolnilne informacije za določene vrste lupin so podane v EN 1993-1-6 in ustreznih aplikativnih delih EN 1993, ki vključujejo:  
- Del 3-1 za stolpe in jambore;  
- Del 3-2 za dimnike;  
- Del 4-1 za silose;  
- Del 4-2 za rezervoarje;  
- Del 4-3 za cevovode.  
(4) Določbe v EN 1999-1-5 se uporabljajo za aksisimetrične lupine (valji, stožci, krogle) in pripadajoče krožne ali obročaste plošče, obroče z nosilnim prerezom in vzdolžne ojačitve, kjer so del celotne konstrukcije.  
(5) Posamezne lupinske plošče (valjaste, stožčaste ali kroglaste) niso izrecno zajete v EN 1999-1-5. Vendar pa so določbe lahko uporabne, če so ustrezni robni pogoji ustrezno upoštevani.  
(6) Vrste lupinskih sten, zajetih v EN 1999-1-5, so lahko (glej sliko 1.1):  
- lupinska stena, izdelana iz ploskih valjanih pločevin s sosednjimi ploščami, povezanimi s čelnimi zvari, imenovana "izotropna";  
- lupinska stena z prekrivanjem, oblikovana s povezovanjem sosednjih plošč s prekrivajočimi se deli, imenovana "prekrivno spojena";  
- lupinska stena z ojačitvami, pritrjenimi na zunanjo stran, imenovana "zunanje ojačana" ne glede na razmik ojačitev;  
- lupinska stena z valovitostmi, ki potekajo vzdolž poldnevnika, imenovana "aksialno valovita";  
- lupinska stena, izdelana iz valovitih pločevin z valovitostmi, ki potekajo okoli oboda lupine, imenovana "obodno valovita".  
[Slika 1.1 - Ilustracija valjaste lupinske oblike]  
(7) Določbe EN 1999-1-5 so namenjene uporabi v temperaturnem območju, določenem v EN 1999-1-1. Najvišja temperatura je omejena tako, da lahko zanemarimo vpliv lezenja. Za konstrukcije, izpostavljene povišanim temperaturam, povezanim s požarom, glej EN 1999-1-2.  
(8) EN 1999-1-5 ne pokriva vidika puščanja.  
1.2 Predpostavke  
(1) Splošne predpostavke EN 1990 veljajo.  
(2) Določbe EN 1999-1-1 veljajo.  
(3) Postopki projektiranja so veljavni le, če so izpolnjene zahteve za izvedbo v EN 1090-3 ali druge enakovredne zahteve.  
(4) EN 1999 je namenjen uporabi v povezavi z:  
- Evropskimi standardi za gradbene proizvode, pomembne za aluminijaste konstrukcije;  
- EN 1090-1, Izvedba jeklenih konstrukcij in aluminijastih konstrukcij - Del 1: Zahteve za ugotavljanje skladnosti konstrukcijskih komponent;  
- EN 1090-3, Izvedba jeklenih konstrukcij in aluminijastih konstrukcij - Del 3: Tehnične zahteve za aluminijaste konstrukcije.

General Information

• Status: Not Published
• Public Enquiry End Date: 28-May-2026
• ICS: 91.010.30 - Technical aspects
• ICS: 91.080.17 - Aluminium structures
• Technical Committee: KON - Structures
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 30-Mar-2026
• Due Date: 17-Aug-2026
• Ref Project: EN 1999-1-5:2023/prA1 - Eurocode 9 - Design of aluminium structures - Part 1-5: Shell structures

Relations

• Amends: kSIST FprEN 1999-1-5:2022 - Eurocode 9 - Design of aluminium structures - Part 1-5: Shell structures
• Effective Date: 30-Jul-2025

Overview

SIST EN 1999-1-5:2023/oprA1:2026 (Eurocode 9 – Design of Aluminium Structures – Part 1-5: Shell Structures) is a European Standard developed by CEN for the structural design of aluminium shell structures. Applicable to both stiffened and unstiffened shells of revolution or round panels in monocoque systems, this Eurocode forms a vital reference for the modern engineering and construction sectors. EN 1999-1-5 introduces specific provisions to extend the coverage of general aluminium structure design codes and ensures the reliability, safety, and durability of aluminium shell structures within a regulated framework.

Eurocode 9 provides harmonized rules and addresses aspects unique to aluminium, considering the distinct material properties and behavior under different loading and environmental conditions. This standard is relevant for designers, engineers, architects, and regulatory bodies involved in the assessment and execution of aluminium shell structures.

Key Topics

• Scope and Coverage: EN 1999-1-5 details the requirements for the design of axisymmetric aluminium shells (cylindrical, conical, or spherical), circular or annular plates, beam section rings, and stringer stiffeners.
• Shell Wall Types: Includes shell walls constructed from:
  • Flat rolled sheet (isotropic, with butt welds)
  • Lap-jointed connections (overlapping plates)
  • Externally stiffened configurations
  • Axially and circumferentially corrugated shells
• Design Limitations: The standard applies within temperature ranges where the effects of material creep can be neglected; fire considerations are governed by EN 1999-1-2.
• Assumptions and Execution: Requires compliance with the general assumptions of EN 1990 and EN 1999-1-1, and only valid when executed in line with EN 1090-3 or equivalent execution standards.
• Integration with Other Standards: References additional guidance for specialized shell applications in EN 1993 (steel structures), such as towers, masts, chimneys, silos, tanks, and pipelines.
• Normative and Informative References: Updates normative references to align with the evolving suite of Eurocodes, including the latest versions of structural and geotechnical design basics.

Applications

EN 1999-1-5 is essential for professionals engaged in:

• Structural engineering of innovative buildings and infrastructure: Ensuring safety and performance in the design of curved aluminium facades, silos, storage tanks, pipelines, and pressure vessels.
• Industrial and transport applications: Relevant for monocoque structures in aerospace, marine, and automotive industries where lightweight shell components are critical.
• Public infrastructure: Applied in the design and assessment of masts, towers, and chimneys made from aluminium.
• Quality assurance and regulatory compliance: Contributes to standardizing best practices across projects, aiding in conformity assessment and facilitating regulatory approval across Europe.

By following EN 1999-1-5, designers can account for specific characteristics of aluminium shells, including buckling resistance and the influence of different joint and stiffening configurations, ensuring robust and optimized structures.

Related Standards

EN 1999-1-5 should be applied in conjunction with related standards, including:

• EN 1999-1-1: General rules for design of aluminium structures
• EN 1999-1-2: Structural fire design for aluminium
• EN 1090-1: Requirements for conformity assessment of structural components
• EN 1090-3: Technical requirements for execution of aluminium structures
• EN 1993-1-6: Shell structures in steel, offering supplementary provisions applicable for certain shell types
• Other Eurocodes: Including EN 1990 (basis of design), EN 1991 (actions on structures), and relevant parts of EN 1993 for specialized applications

Practical Value

Adhering to EN 1999-1-5 helps stakeholders:

• Ensure design solutions meet harmonized European requirements for aluminium shell structures
• Streamline project delivery by referencing recognized international best practices
• Enhance competitiveness and reputation by delivering structures verified against stringent performance criteria
• Facilitate cross-border engineering projects by relying on a common technical language

SIST EN 1999-1-5:2023/oprA1:2026 is indispensable for anyone involved in the safe, efficient, and compliant design of aluminium shell structures across Europe and internationally.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Evrokod 9 - Projektiranje konstrukcij iz aluminijevih zlitin - 1-5. del: Lupinaste
konstrukcije
Eurocode 9 - Design of aluminium structures - Part 1-5: Shell structures
Eurocode 9 - Bemessung und Konstruktion von Aluminiumtragwerken - Teil 1-5:
Schalentragwerke
Eurocode 9 - Calcul des structures en aluminium - Partie 1-5 : Coques
Ta slovenski standard je istoveten z: EN 1999-1-5:2023/prA1
ICS:
91.010.30 Tehnični vidiki Technical aspects
91.080.17 Aluminijaste konstrukcije Aluminium structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 1999-1-5:2023
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
March 2026
ICS 91.010.30; 91.080.17
English Version
Eurocode 9 - Design of aluminium structures - Part 1-5:
Shell structures
Eurocode 9 - Calcul des structures en aluminium - Eurocode 9 - Bemessung und Konstruktion von
Partie 1-5 : Coques Aluminiumtragwerken - Teil 1-5: Schalentragwerke
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 1999-1-5:2023. 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 1999-1-5:2023/prA1:2026 E
worldwide for CEN national Members.

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 Modification to Clause 2, "Normative references" . 5
5 Modifications to 8.2.4.4 "Buckling resistance of unstiffened welded shells" . 5
6 Modifications to A.3.2.3, "Meridional buckling parameter" . 5
7 Modifications to A.3.3.3, "Circumferential buckling parameter" . 5
8 Modifications to A.3.4.3, "Shear buckling parameters" . 5
...