ISO 10252:2020

INTERNATIONAL ISO
STANDARD 10252
First edition
2020-02
Bases for design of structures —
Accidental actions
Bases du calcul des constructions — Actions accidentelles
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 3
4.1 General . 3
4.2 Latin upper case letters . 3
4.3 Latin lower case letters. 4
4.4 Greek letters . 4
4.5 Subscripts . 5
5 General principles and conceptual approach . 5
5.1 Types of accidental actions . 5
5.2 Conceptual approach . 6
5.2.1 Target reliability level . 6
5.2.2 Strategies . 6
5.2.3 Identified and unidentified actions . 6
5.2.4 Types of analysis . 6
5.2.5 Classification of structures based on consequences . 7
5.2.6 Appropriate methods of analyses based on consequences. 7
5.3 Modelling of accidental actions . 8
5.3.1 Identified actions . 8
5.3.2 Unidentified accidental actions . 9
5.3.3 Representative values for accidental actions . 9
5.4 Structural analysis involving accidental actions .10
6 Impact action .10
6.1 General .10
6.1.1 Sources of impact loading .10
6.1.2 Nature of the impact .11
6.1.3 Structural analysis and simplifications .11
6.2 Impact from specific causes .14
6.2.1 Impact from road vehicles .14
6.2.2 Impact from derailed trains .14
6.2.3 Impact from ships .14
6.2.4 Impact from aircraft .15
6.2.5 Impact from helicopters .15
6.2.6 Impact from forklift trucks .15
6.2.7 Other types of impact .15
7 Explosion .16
7.1 General .16
7.1.1 Explosion types to be considered .16
7.1.2 Nature and schematisation of explosion loading . .16
7.1.3 Structural analysis and simplifications .17
7.2 Explosions of various types .18
7.2.1 Interior explosions .18
7.2.2 Exterior explosion .18
7.2.3 Explosions in tunnels .18
7.2.4 Dust explosions .18
7.2.5 High energy explosions .19
8 Unidentified actions .19
8.1 General .19
8.2 Notional removal of or damage to elements .19
8.3 Notional loads on key elements .20
8.4 Risk-based design for unidentified accidental actions .20
Annex A (informative) Guidance for detailed impact analysis .21
Annex B (informative) Guidance on detailed explosion analysis .58
Annex C (informative) Design for accidental actions .86
Bibliography .103
iv © ISO 2020 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 98, Bases for design of structures,
Subcommittee SC 3, Loads, forces and other actions.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
Introduction
This document provides requirements and guidelines for the design and assessment of structures in
relation to the possible occurrence of accidental actions induced by human activities. Fire and man-
made earthquake, however, are not included.
This document is fully aligned with ISO 2394 and gives information for risk informed decision making
and semi-probabilistic design and assessment. Like in most modern codes nowadays, attention is given
to explicit modelling of hazard scenarios as well as to more implicit safety measurements following
from robustness requirements.
This document aims at promoting harmonization of design practice internationally and unification
between the respective codes and standards such as
...