EN 1991-1-9:2025/prA1

• Abstract:

  1.1 Scope of EN 1991-1-9; (1) EN 1991 1 9 gives principles and rules to determine the values of loads due to atmospheric icing to be used for following types of structures:; - masts;; - towers;; - antennas and antenna structures;; - cables, stays, guy ropes and similar structures;; - rope ways (cable railways);; - structures for ski-lifts;; - buildings or parts of them exposed to potential icing;; - special types of structures, such as towers for transmission lines and wind turbines.; NOTE Atmospheric icing on electrical overhead lines is covered by EN 50341-1.; (2) EN 1991-1-9 specifies values for:; - dimensions and weight of accreted ice;; - shapes of accreted ice.; (3) EN 1991-1-9 covers types of icing, ice loads acting on structures, and falling ice considerations.; NOTE For wind actions on iced structures, see EN 1991-1-4.; 1.2 Assumptions; The assumptions given in EN 1990:2023, 1.2 apply.; EN 1991-1-9 is intended to be used with EN 1990 (all parts), the other parts of EN 1991 and EN 1992 (all parts) to EN 1999 (all parts) for the design of structures.

• Status: Not Published
• Publication Date: 09-Feb-2028
• ICS: 91.010.30 - Technical aspects
• Technical Committee: CEN/TC 250 - Structural Eurocodes
• Drafting Committee: CEN/TC 250/SC 1/WG 2 - Atmospheric icing of structures
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 23-Jul-2026
• Due Date: 17-Dec-2026
• Completion Date: 23-Jul-2026
• Ref Project: SIST EN 1991-1-9:2025/oprA1:2026 - Eurocode 1 - Actions on structures - Part 1-9: Atmospheric icing

• Amends: EN 1991-1-9:2025 - Eurocode 1 - Actions on structures - Part 1-9: Atmospheric icing
• Effective Date: 05-Nov-2025

Overview

EN 1991-1-9:2025/prA1, developed by CEN, forms part of the Eurocode 1 series and addresses actions on structures due to atmospheric icing. This standard sets out principles and rules for calculating the loads resulting from atmospheric icing on a variety of structural types. The aim is to ensure structural safety and durability, particularly for elements exposed to cold climates where ice accretion is a risk factor. EN 1991-1-9:2025/prA1 is relevant for both the initial design and the assessment of existing structures.

The document also describes updates and modifications in line with advancements in structural engineering and harmonizes references with related Eurocodes and standards.

Key Topics

• Scope of Application:
  EN 1991-1-9 applies to masts, towers, antennas, antenna structures, cables, stays, guy ropes, ropeways (including cable railways), ski-lift structures, and any buildings or parts exposed to potential icing. Special structures like transmission line towers and wind turbines are also covered.

• Types of Icing and Loads:
  The standard categorizes types of atmospheric icing and details how these lead to ice loads acting on structures. Considerations include:

  • Dimensions and weight of accreted ice
  • Shapes of ice formations
  • Influence of wind and environmental conditions

• Load Calculations:
  Provisions are made for determining loads due to ice accretion, including:

  • Guidance for single members with width greater than 0.3 m
  • Variation of loading with height above ground level
  • Combination rules for ice loads with other types of structural actions

• Safety and Compliance:
  EN 1991-1-9 is designed to be used with EN 1990 and other Eurocode parts, ensuring full structural safety and regulatory compliance. National implementations may set certain parameters through National Annexes.

Applications

The practical value of EN 1991-1-9:2025/prA1 lies in enhancing the reliability and safety of structures susceptible to atmospheric icing. Its main applications include:

• Design and Assessment:

  • New construction of exposed structures (e.g., telecommunication masts, power transmission towers, ski-lifts, wind turbines)
  • Retrofitting or upgrading existing structures for ice load resistance

• Operation and Maintenance:

  • Inspection regimes for assets located in cold regions
  • Planning for falling ice risks and protection for personnel and equipment

• Infrastructure Development:

  • Civil engineering projects in mountainous or northern areas
  • Transportation infrastructure like cableways and aerial tramways

Related Standards

EN 1991-1-9:2025/prA1 should be used alongside other key standards for a comprehensive approach to structural design:

• EN 1990-1:2023+A1:2026 – Eurocode – Basis of structural and geotechnical design
• EN 1991-1-4:2026 – Wind actions on structures
• EN 50341-1 – Overhead electrical lines (for atmospheric icing on these structures)
• EN 1992 to EN 1999 – Design standards for concrete, steel, composite, timber, and other material-specific structures
• EN 1998 – Design for seismic actions

The Eurocode 1 series, including this part on atmospheric icing, supports structural engineers and designers across Europe in producing robust, regulatory-compliant solutions where environmental loads are a critical concern.

Employing EN 1991-1-9:2025/prA1 helps optimize safety, improve risk management, and ensures enduring performance of civil structures exposed to the challenges of atmospheric icing.

SLOVENSKI STANDARD
01-junij-2026
Evrokod 1 - Vplivi na konstrukcije - 1-9. del: Atmosferski žled
Eurocode 1 - Actions on structures - Part 1-9: Atmospheric icing
Eurocode 1 - Einwirkungen auf Tragwerke - Teil 1-9: Atmosphärische Eisbildung
Eurocode 1 - Actions sur les structures - Partie 1-9 : Actions du givre atmosphérique
Ta slovenski standard je istoveten z: EN 1991-1-9:2025/prA1
ICS:
91.010.30 Tehnični vidiki Technical aspects
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 1991-1-9:2025
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
April 2026
ICS 91.010.30
English Version
Eurocode 1 - Actions on structures - Part 1-9: Atmospheric
icing
Eurocode 1 - Actions sur les structures - Partie 1-9 : Eurocode 1 - Einwirkungen auf Tragwerke - Teil 1-9:
Actions du givre atmosphérique Atmosphärische Eisbildung
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 1991-1-9:2025. 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 1991-1-9:2025/prA1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modifications throughout the whole document . 4
2 Modification to the Introduction . 4
3 Modification to Clause 2, “Normative References” . 4
4 Modification to Clause 3, “Terms and definitions” . 4
5 Modification to 6.4.2.2, “Single members with width (W) > 0,3 m” . 4
6 Modification to 6.5, “Variation with height above the ground” . 4
7 Modification to Clause 7, “Combination of ice loads with other actions” . 4
8 Modification to B.4, “Rime icing on members inclined to the wind d
...