ISO/TR 12470-1:2017

TECHNICAL ISO/TR
REPORT 12470-1
First edition
2017-11
Fire-resistance tests — Guidance
on the application and extension
of results from tests conducted on
fire containment assemblies and
products —
Part 1:
Loadbearing elements and vertical
and horizontal separating elements
Essais de résistance au feu — Recommandations pour l'application
et l'extrapolation des résultats d'essais réalisés sur les produits et
assemblages d'endiguement du feu —
Partie 1: Éléments porteurs et éléments horizontaux et verticaux de
séparation
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Principles of the field of application . 4
4.1 Direct application . 4
4.2 Extended application . 4
4.2.1 Rules of extended application . 5
4.2.2 Calculations and computer programs used in extended applications . 5
4.2.3 Judgements in extended applications . 5
4.3 Project specific application . 5
5 Common factors which influence the field of application of all elements .6
5.1 Manufacture and materials . 6
5.1.1 General. 6
5.1.2 Direct application . 6
6 Loadbearing elements . 6
6.1 Walls . 7
6.1.1 General. 7
6.2 Direct application . 7
6.2.1 Common parameters of all forms of wall construction . 7
6.2.2 Extended application . 9
6.3 Floors.11
6.3.1 General.11
6.3.2 Direct application .11
6.3.3 Extended application .13
7 Non-loadbearing elements .15
7.1 Vertical partitions .15
7.1.1 General.15
7.1.2 Direct application .15
7.1.3 Extended application .16
7.2 Horizontal “partitions” ceiling membranes .20
7.2.1 General.20
7.2.2 Direct application .20
7.2.3 Extended application .21
8 Evolution of testing and summary of quantifiable approaches .25
8.1 Improvement of testing methodologies .25
8.1.1 Existing test methods .26
8.1.2 Test using reduced-size specimen (reduced-scale test) .27
8.1.3 Selection of the specimen .27
8.2 Mathematical modelling of thermal and mechanical response .28
8.2.1 Level 1 — Numerical regression analysis .28
8.2.2 Level 2 — Graphical approach .28
8.2.3 Level 2 — 3D interpolation .28
8.2.4 Level 3 — Physical equation analysis .29
8.2.5 Level 4 — Finite element methods .29
8.2.6 Level 5 — Integrated interactive analysis .30
8.3 Expert system based upon the use of performance coefficients.30
8.3.1 Concept .30
8.3.2 Establishing the coefficients .31
8.3.3 Obtaining benefit from excess performance .31
Annex A (informative) Principles of using expert judgement to establishing to the extended
field of application .32
Bibliography .39
iv © ISO 2017 – 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
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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 on the voluntary nature of standards, the meaning of ISO specific terms and
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URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 2, Fire
containment.
A list of all parts in the ISO 12470 series can be found on the ISO website.
Introduction
Fire resistance tests on building components are necessary to establish their behaviour against pre-
determined criteria when exposed to a representative fully developed fire and to provide information
that may be used in determining the fire safety of buildings. For several decades, people have accepted,
by means of test results only, the possibility of grading the components. Now, due to the enhancement
of our knowledge and the complexity of buildings, it is necessary to be able to give a more accurate
assessment of the components used in buildings, particularly with the growth of the use of functional
approaches to designing fire safe structures.
The need to understand how the element will perform at a different size, with different levels of
restraint, etc. is vital when applying the results of the fire tests in a life safety situation, especially
those where the fire safe solution has been generated using fire safety engineering techniques rather
than using a code compliant solution. This does not negate the need to predict any changes that may
result from changes to the test construction when complying with building code solutions, but these
codes may themselves provide solutions that take into account the influence or impact of changes, and
indeed the guidance given in this document may be used by the code writers to produce such guidance.
Even with the knowledge available to assess the behaviour of a given constructional element, whatever
its design or its size, we will still be some distance away from establish
...