prEN 1991-1-8

SLOVENSKI STANDARD
01-junij-2024
Evrokod 1 - Vplivi na konstrukcije - 1-8. del: Vplivi valov in tokov na obalne
konstrukcije
Eurocode 1 - Actions on structures - Part 1-8: Actions from waves and currents on
coastal structures
Eurocode 1 - Einwirkungen auf Tragwerke - Teil 1-8: Einwirkungen durch Wellen und
Strömungen auf Küstenbauwerke
Eurocode 1 - Actions sur les structures - Partie 1-8 : Actions des vagues et des courants
sur les structures côtières
Ta slovenski standard je istoveten z: prEN 1991-1-8
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
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2024
ICS 91.010.30
English Version
Eurocode 1 - Actions on structures - Part 1-8: Actions from
waves and currents on coastal structures
Eurocode 1 - Actions sur les structures - Partie 1-8 : Eurocode 1 - Einwirkungen auf Tragwerke - Teil 1-8:
Actions des vagues et des courants sur les structures Allgemeine Einwirkungen - Einwirkungen durch
côtières Wellen und Strömungen auf Küstenbauwerke
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 250.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard 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.

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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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1991-1-8:2024 E
worldwide for CEN national Members.

Contents
European foreword . 10
Introduction . 11
1 Scope . 14
1.1 Scope of EN 1991-1-8 . 14
1.2 Assumptions . 15
2 Normative references . 15
3 Terms, definitions and symbols . 16
3.1 Terms and definitions . 16
3.1.1 Terms relating to physical environment and environmental processes. 16
3.1.2 Terms relating to analysis of metocean parameters . 19
3.1.3 Terms relating to statistical metocean parameters . 22
3.1.4 Terms relating to metocean effects in interaction with structures . 27
3.1.5 Terms relating to coastal structures . 30
3.2 Symbols and abbreviations . 33
3.2.1 Latin upper-case letters . 33
3.2.2 Latin lower-case letters . 36
3.2.3 Greek upper-case letters . 37
3.2.4 Greek lower-case letters . 37
4 Basis of wave and current action assessment . 39
4.1 General. 39
4.2 Design approaches . 39
4.2.1 General. 39
4.2.2 Semi-probabilistic design approach . 39
4.2.3 Reliability-based design approach . 39
4.2.4 Risk-informed decision-making design approach . 40
4.2.5 Design assisted by physical testing . 40
4.3 Action modelling . 40
4.3.1 Classification of actions from waves and currents . 40
4.3.2 Metocean parameters. 40
4.3.3 General methods for the assessment of the hydrodynamic loads . 41
4.4 Design situations . 41
4.5 Geometrical parameters . 42
4.6 Hydrodynamic estimate approaches . 43
4.7 Representative values of hydrodynamic loads . 45
4.7.1 General. 45
4.7.2 Characteristic value . 47
4.7.3 Combination value . 47
4.7.4 Frequent value . 47
4.7.5 Quasi-permanent value . 48
4.8 Design value and importance factor . 48
4.9 Specific combinations rules for metocean parameters . 49
4.9.1 General provisions . 49
4.9.2 Combination rules using marginal distributions of the metocean parameters
(marginal deep-sea extremes method) . 50
4.9.3 Combination rules using joint distributions of the metocean parameters (joint deep-
sea extremes method) . 50
4.9.4 Specific combination rules between waves, currents and wind . 51
4.10 Accidental metocean events . 52
5 Hydrodynamic conditions . 53
5.1 General . 53
5.1.1 Metocean design description . 53
5.1.2 Metocean data . 53
5.1.3 Wave and current interactions with structures . 53
5.2 Design event probability and extreme values analysis . 54
5.2.1 General . 54
5.2.2 Extreme value analysis . 55
5.3 Water levels . 56
5.3.1 Design water level . 56
5.3.2 Water level measurements . 56
5.3.3 Tides . 56
5.3.4 Surges . 57
5.4 Waves . 57
5.4.1 General . 57
5.4.2 Wave set-up . 58
5.4.3 Frequency and directional distribution of waves . 58
5.4.4 Spectral wave description . 58
5.4.5 Storm-representative wave parameters . 59
5.4.6 Wave data sources . 59
5.4.7 Wave transformation . 60
5.4.8 Wave data for extreme value analysis . 61
5.4.9 Nearshore wave processes . 61
5.4.10 Regular wave theories . 62
5.4.11 Wave shape and kinematics . 62
5.4.12 Long waves . 64
5.5 Currents . 65
5.5.1 General . 65
5.5.2 Current data sources . 65
5.5.3 Current velocity and profile . 66
5.6 Climate change . 66
6 Wave and current actions on fixed cylindrical structures and suspended decks . 67
6.1 General .
...