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ISO 12122-2:2014

(Main)

Timber structures — Determination of characteristic values — Part 2: Sawn timber

Timber structures — Determination of characteristic values — Part 2: Sawn timber

ISO 12122-2:2014 gives methods for the determination of characteristic values for a defined population of sawn timber products, calculated from test values. It presents methods for the determination of: characteristic value of mean-based properties, and characteristic value of 5th percentile-based properties.

Structures en bois — Détermination des valeurs caractéristiques — Partie 2: Bois massif

General Information

Status
Published
Publication Date
24-Feb-2014
ICS
91.080.20 - Timber structures
Technical Committee
ISO/TC 165 - Timber structures
Drafting Committee
ISO/TC 165/WG 10 - Characteristic values and design specifications
Current Stage
9093 - International Standard confirmed
Completion Date
03-Dec-2019
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ISO 12122-2:2014 - Timber structures -- Determination of characteristic valuesISO 12122-2:2014 - Timber structures -- Determination of characteristic values
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ISO 12122-2:2014 - Timber structures -- Determination of characteristic values
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INTERNATIONAL ISO
STANDARD 12122-2
First edition
2014-03-01
Timber structures — Determination
of characteristic values —
Part 2:
Sawn timber
Structures en bois — Détermination des valeurs caractéristiques —
Partie 2: Bois massif
Reference number
ISO 12122-2:2014(E)
©
ISO 2014

---------------------- Page: 1 ----------------------
ISO 12122-2:2014(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2014
All rights reserved. Unless otherwise specified, 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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 12122-2:2014(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 1
5 Reference Population . 1
6 Sampling . 2
6.1 Sampling method . 2
6.2 Sample size . 2
7 Sample conditioning . 2
8 Test data . 2
8.1 Test method . 2
8.2 Test data compatible with product description . 2
9 Evaluation of characteristic values for structural properties . 3
9.1 Structural properties . 3
9.2 Characteristic modulus of elasticity . 3
9.3 Characteristic values of strength . 3
10 Report . 3
Annex A (informative) Commentary . 4
Bibliography . 7
© ISO 2014 – All rights reserved iii

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ISO 12122-2:2014(E)

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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 165, Structural Timber.
ISO 12122 consists of the following parts, under the general title Timber structures — Determination of
characteristic values:
— Part 1: Basic requirements
— Part 2: Sawn timber
iv © ISO 2014 – All rights reserved

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ISO 12122-2:2014(E)

Introduction
This International Standard sets out a framework for establishing characteristic values from test results
on a sample drawn from a clearly defined reference population of sawn timber. The characteristic value
is an estimate of the property of the reference population with a consistent level of confidence prescribed
in the standard.
This part of ISO 12122 is to be used in conjunction with ISO 12122-1.
This part of ISO 12122 permits the evaluation of characteristic values on testing on commercial sized
specimens of sawn timber.
This part of ISO 12122 is applicable to structural sawn timber. In some cases, characteristic values
determined in accordance with this part of ISO 12122 can be modified to become a design value.
This part of ISO 12122 has the following annexes:
— Annex A presents a commentary on this part of ISO 12122.
© ISO 2014 – All rights reserved v

---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 12122-2:2014(E)
Timber structures — Determination of characteristic
values —
Part 2:
Sawn timber
1 Scope
This International Standard gives methods for the determination of characteristic values for a defined
population of sawn timber products, calculated from test values.
It presents methods for the determination of
a) characteristic value of mean-based properties, and
b) characteristic value of 5th percentile-based properties.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 12122-1, Timber structures — Determination of characteristic values — Part 1: Basic requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12122-1 apply.
4 Symbols and abbreviated terms
Symbols defined in the relevant ISO product or test standard shall be used. Other symbols are defined
in ISO 12122-1.
5 Reference Population
In addition to the requirements for definition of the reference population in ISO 12122-1, the following
attributes of sawn timber may be described:
a) climate or climate range of growing region;
b) altitude or altitude range of growing region;
c) specific silvicultural practices used in the growing region;
d) soil type or range of soil types of growing region;
e) sawing patterns (e.g. backsawn or quartersawn, core wood included or excluded);
f) seasoning method (if seasoned);
g) grading or production method.
© ISO 2014 – All rights reserved 1

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ISO 12122-2:2014(E)

6 Sampling
6.1 Sampling method
The sampling method shall comply with the performance objective of sampling defined in ISO 12122-1.
Representation of each of the variants in the sample shall approximate the representation of the same
variants in the reference population.
The sampling method shall be documented in the report as detailed in Clause 10 and this documentation
shall indicate a response to each of the identified attributes of the reference population listed in
compliance with Clause 5 in this part of ISO 12122 and in ISO 12122-1.
6.2 Sample size
The sample size shall comply with requirements of ISO 12122-1 and shall take into account the coefficient
of variation (V) expected for the sawn timber in the reference population.
NOTE 1 See notes under the relevant clause in ISO 12122-1.
Sawn timber properties generally have larger population coefficient of variation (V), and should
therefore have a larger sample size.
NOTE 2 ISO 12122-1 gives some guidance on selecting sample size.
7 Sample conditioning
The sample storage and testing environment shall refl
...

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