SIST EN 1999-1-5:2023/kprA1:2026
(Amendment)Eurocode 9 - Design of aluminium structures - Part 1-5: Shell structures
- Abstract
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.
- 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 1999-1-5:2023/kprA1:2026 is the SIST draft amendment to Eurocode 9, Part 1-5, for the design of aluminium shell structures. It updates EN 1999-1-5:2023 so designers can apply the shell rules together with EN 1990-1 and the related aluminium Eurocode parts. The document is for structural engineers, checkers, and execution teams working with aluminium shell forms.
What does SIST EN 1999-1-5:2023/kprA1:2026 specify?
SIST EN 1999-1-5:2023/kprA1:2026 amends the shell-structure rules in EN 1999-1-5:2023. The underlying Part 1-5 applies to the structural design of aluminium shell structures, both stiffened and unstiffened, including shells of revolution and round panels in monocoque structures.
The scope covers axisymmetric shells such as cylinders, cones and spheres, together with associated circular or annular plates, beam section rings and stringer stiffeners when they form part of the complete structure. It also identifies shell-wall forms such as isotropic, lap-jointed, externally stiffened, axially corrugated and circumferentially corrugated shells.
EN 1999-1-5 is intended for the temperature range defined in EN 1999-1-1, with the maximum temperature limited so creep can be neglected. It does not cover leakage, and for fire conditions it points to EN 1999-1-2.
| Annex | What it covers |
|---|---|
| Annex A | Buckling parameters and load-case values used in shell resistance checks |
What are the key requirements of SIST EN 1999-1-5:2023/kprA1:2026?
Document-wide reference updates
The amendment replaces several document-wide references so the shell rules point to the current companion texts. References to EN 1990 become EN 1990-1, and references to EN 1999-1-1:2023, EN 1999-1-2:2023, EN 1999-1-3:2023 and EN 1999-1-4:2023 become the corresponding +A1:2026 versions.
In practice, this means users need to check calculations and specifications against the updated Eurocode set, not the earlier 2023 references.
Changes to the introduction and scope
The Introduction in 0.1 is updated to list the Eurocodes from EN 1990 through EN 1999 and EN 19100, and it adds a note that EN 1999 is intended for use with EN 1990-1 and the other Eurocodes for new structures. Clause 1.2 also has a paragraph deleted and the following text renumbered.
For a designer, this keeps the Eurocode framework aligned and makes the intended companion documents clearer when assembling a design basis.
Changes to shell buckling design data
Clause 8.2.4.4 changes the reference from Table 8.5 to Table 8.1 in the key to Formula (8.28), and Table 8.1 gives values for relevant load cases allowed for in Annex A. The table distinguishes axial compression, circumferential compression, torsion and shear, with different values for tolerance classes and material classes A, B and C.
In practice, this is the table to use when checking buckling resistance of unstiffened welded shells, so the correct load case and class must be selected before the resistance check is carried out.
Changes in Annex A buckling parameters
Annex A is updated in A.3.2.3, A.3.3.3 and A.3.4.3. These changes add μ and the slenderness parameter to the descriptions of the meridional buckling parameter, circumferential buckling parameter and shear buckling parameters.
For the user, that means the calculation inputs or software output should show those variables explicitly when evaluating the relevant buckling modes.
What terms does SIST EN 1999-1-5:2023/kprA1:2026 define?
- Shell of revolution - a shell formed by rotating a profile around an axis, such as a cylinder, cone or sphere.
- Round panel - a circular or annular panel used within a monocoque structure.
- Monocoque structure - a structure in which the shell itself is part of the main load-carrying form.
- Axisymmetric shell - a shell with rotational symmetry; the document applies this to cylinders, cones and spheres.
- Lap-jointed shell wall - a shell wall made from adjacent plates joined with overlapping sections.
- Externally stiffened shell wall - a shell wall with stiffeners attached to the outside.
- Axially corrugated / circumferentially corrugated - corrugations running along the meridian or around the shell circumference.
Who uses SIST EN 1999-1-5:2023/kprA1:2026?
Structural engineers use this standard when designing aluminium shell structures and checking their buckling resistance. Detailers and reviewers use it to confirm which shell form, stiffening arrangement, and load-case data apply to a project.
It is also used by execution and conformity-assessment teams working with aluminium structures under EN 1090-3 and EN 1090-1. In practice, it helps align the calculation basis, fabrication expectations, and design documentation for shell-type aluminium structures.
What changed in SIST EN 1999-1-5:2023/kprA1:2026 from the previous edition?
SIST EN 1999-1-5:2023/kprA1:2026 amends EN 1999-1-5:2023. The changes stated in the document are:
- document-wide replacement of EN 1990 with EN 1990-1
- document-wide replacement of EN 1999-1-1:2023, EN 1999-1-2:2023, EN 1999-1-3:2023 and EN 1999-1-4:2023 with the +A1:2026 versions
- update of the Introduction list of Eurocodes and the addition of a note on use with EN 1990-1 and the other Eurocodes
- deletion of paragraph (4) in Clause 1.2 and renumbering of the following text
- replacement of the normative reference to EN 1990 with EN 1990-1
- replacement of Table 8.5 with Table 8.1 in Clause 8.2.4.4
- additions to A.3.2.3, A.3.3.3 and A.3.4.3 for the buckling parameter descriptions
Which standards are used with SIST EN 1999-1-5:2023/kprA1:2026?
| Standard | What it contributes |
|---|---|
| EN 1990-1 | Basis of structural and geotechnical design for new structures |
| EN 1999-1-1:2023+A1:2026 | General aluminium design rules used with Part 1-5 |
| EN 1999-1-2:2023+A1:2026 | Fire-related design rules for aluminium structures |
| EN 1999-1-3:2023+A1:2026 | Companion aluminium part named by the amendment |
| EN 1999-1-4:2023+A1:2026 | Companion aluminium part named by the amendment |
| EN 1090-1 | Requirements for conformity assessment of structural components |
| EN 1090-3 | Technical requirements for execution of aluminium structures |
| EN 1993-1-6 and EN 1993-3-1, -3-2, -4-1, -4-2, -4-3 | Supplementary information for certain shell types |
What does the SIST EN 1999-1-5:2023/kprA1:2026 document contain?
The document contains a European foreword and eight modification items. The changes are organised clause by clause, starting with document-wide reference replacements and then moving to the Introduction, Scope and Normative references.
It also contains a specific change to Clause 8.2.4.4 on buckling resistance of unstiffened welded shells, including the table linked to Formula (8.28). Annex A is updated in three subclauses covering meridional, circumferential and shear buckling parameters.
For a user applying the standard, the important content is the revised references, the updated load-case table, and the amended buckling-parameter definitions used in shell resistance checks.
Relations
- Amends
kSIST FprEN 1999-1-5:2022 - Eurocode 9 - Design of aluminium structures - Part 1-5: Shell structures - Effective Date
- 30-Jul-2025
Get Certified
Connect with accredited certification bodies for this standard
DIBt (Deutsches Institut für Bautechnik)
German Institute for Building Technology.
DIN CERTCO
DIN Group product certification.
Aboma Certification B.V.
Specialized in construction, metal, and transport sectors.
Sponsored listings
Frequently Asked Questions
SIST EN 1999-1-5:2023/kprA1:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Eurocode 9 - Design of aluminium structures - Part 1-5: Shell structures". This standard covers: 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.
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.
SIST EN 1999-1-5:2023/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 1999-1-5:2023/kprA1:2026 has the following relationships with other standards: It is inter standard links to kSIST FprEN 1999-1-5:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 1999-1-5:2023/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 1999-1-5:2023/oprA1:2026
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
SIST EN 1999-1-5:2023/oprA1:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
SIST EN 1999-1-5:2023/oprA1:2026
SIST EN 1999-1-5:2023/oprA1:2026
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.
SIST EN 1999-1-5:2023/oprA1:2026
EN 1999-1-5:2023/prA1:2026 (E)
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
...