ISO 12122-3:2016

Timber structures — Determination of characteristic values — Part 3: Glued laminated timber

ISO 12122-3:2016 gives methods for the determination of characteristic values for a defined population of glued laminated 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. NOTE Annex B gives information on the methods that have been successfully used to estimate the characteristic values of glued laminated timber products from properties of the laminates.

Structures en bois — Détermination des valeurs caractéristiques — Partie 3: Exigences pour les bois lamellé-collé

General Information

• Status: Published
• Publication Date: 28-Jun-2016
• 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: 25-Feb-2022

Relations

• Consolidated By: ISO 6647-2:2020 - Rice — Determination of amylose content — Part 2: Spectrophotometric routine method without defatting procedure and with calibration from rice standards
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 12122-3
First edition
2016-07-01
Timber structures — Determination
of characteristic values —
Part 3:
Glued laminated timber
Structures en bois — Détermination des valeurs caractéristiques —
Partie 3: Exigences pour les bois lamellé-collé
Reference number
ISO 12122-3:2016(E)
©
ISO 2016

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ISO 12122-3:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved

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ISO 12122-3:2016(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 . 3
8.3 Failure modes . 3
9 Evaluation of characteristic values for structural properties . 3
9.1 Structural properties . 3
9.2 Characteristic modulus of elasticity or stiffness . 3
9.3 Characteristic values of strength or capacity . 3
9.3.1 Characteristic bearing strength . 3
9.3.2 Other characteristic values for strength or capacity based on the 5th
percentile test value . 3
10 Report . 3
Annex A (informative) Commentary . 4
Annex B (informative) Analytical models for determining characteristic properties of glued
laminated timber . 8
Bibliography . 9
© ISO 2016 – All rights reserved iii

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ISO 12122-3:2016(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 World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 165, Timber structures.
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
— Part 3: Glued laminated timber
1)
— Part 4: Engineered wood products
1)
— Part 6: Large components and assemblies
The following parts are under preparation:
— Part 5: Mechanical connections
1) To be published.
iv © ISO 2016 – All rights reserved

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ISO 12122-3:2016(E)

Introduction
This part of ISO 12122 sets out a framework for establishing characteristic values from test results on a
sample drawn from a clearly defined reference population of glued laminated timber. The characteristic
value is an estimate of the property of the reference population with a consistent level of confidence
prescribed in this part of ISO 12122.
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 glued laminated timber. Where the characteristic values are derived using calculations
based on laminate structural properties, this part of ISO 12122 does not apply, but Annex B references
other methods for estimating characteristic values.
In some cases, characteristic values determined in accordance with this part of ISO 12122 may 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;
— Annex B presents information on analytical models for determining characteristic values of glued
laminated timber.
© ISO 2016 – All rights reserved v

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INTERNATIONAL STANDARD ISO 12122-3:2016(E)
Timber structures — Determination of characteristic
values —
Part 3:
Glued laminated timber
1 Scope
This part of ISO 12122 gives methods for the determination of characteristic values for a defined
population of glued laminated 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.
NOTE Annex B gives information on the methods that have been successfully used to estimate the
characteristic values of glued laminated timber products from properties of the laminates.
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 8375, Timber structures — Glued laminated timber — Test methods for determination of physical and
mechanical properties
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 and ISO 12578 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
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 glued laminated timber may be included:
a) sources of raw material;
© ISO 2016 – All rights reserved 1

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ISO 12122-3:2016(E)

b) seasoning method (if seasoned);
c) grading or production method for laminates including presence and frequency of finger joints;
d) layup of the glued laminated product;
e) specification of adhesives, method of application and method of curing adhesives;
f) quality control measures;
g) variations in the laminates (if any).
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 and in ISO 12122-1 or otherwise important to the description of the reference
population.
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 glued laminated timber in the reference population.
NOTE 1 See notes under the relevant clause in ISO 12122-1.
NOTE 2 ISO 12122-1 gives some guidance on selecting sample size.
7 Sample conditioning
The sample storage and testing environment shall reflect conditioning in accordance with the definition
of the reference population as indicated in ISO 12122-1. Due to the large size of glued laminated timber,
it is acceptable to test the sample at as-tested conditions provided that the results are adjusted in
accordance with 8.2.
8 Test data
8.1 Test method
The test data shall be obtained from
a) ISO 8375, or
b) a standard test method appropriate for the glued laminated timber reference population provided
equivalency factors with ISO 8375 can be established.
NOTE See notes under the relevant clause in ISO 12122-1.
Test methods involve many variables that will affect results including loading configuration and rates,
specimen positioning and measurement methods. The level of precision of these variables should be
appropriate to the objectives of the testing and the adjustments required in 8.2.
2 © ISO 2016 – All rights reserved

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ISO 12122-3:2016(E)

8.2 Test data compatible with product description
Where the characteristic value is applicable to a standard size or moisture content, adjustments to the
raw test data may be required. Any adjustment shall be in accordance with ISO 12122-1 and shall be
detailed in the report.
NOTE These adjustments include those required to pool data from different test programs as outlined in
ISO 12122-1.
8.3 Failure modes
The failure modes obtained in the tests shall be recorded.
The data shall only be included in the analysis if it comes from a test in which the failure mode
appropriate to the property was obtained.
NOTE The same test method may produce different failure modes on different products. The chara
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 12122-3
ISO/TC 165 Secretariat: SCC
Voting begins on: Voting terminates on:
2015-08-17 2015-11-17
Timber structures — Determination of characteristic
values —
Part 3:
Glued laminated timber
Structures en bois — Détermination des valeurs caractéristiques —
Partie 3: Exigences pour les bois lamellé-collé
ICS: 91.080.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 12122-3:2015(E)
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. ISO 2015

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ISO/DIS 12122-3:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland
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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/DIS 12122-3
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 . 3
8.3 Failure modes . 3
9 Evaluation of characteristic values for structural properties . 3
9.1 Structural properties . 3
9.2 Characteristic modulus of elasticity and shear modulus . 3
9.3 Characteristic values of strength . 3
9.3.1 Characteristic bearing strength . 3
th
9.3.2 Other characteristic values for strength based on the 5 percentile test value. 3
10 Report . 3
Annex A (informative) Commentary . 4
A.1 Commentary on scope . 4
A.2 Commentary on normative references. 4
A.3 Commentary on terms and definitions . 4
A.4 Commentary on symbols . 4
A.5 Commentary on reference population . 4
A.6 Commentary on sampling . 5
A.7 Commentary on sample conditioning . 6
A.8 Commentary on testing . 6
A.8.1 Commentary on test method . 6
A.8.2 Commentary on test data compatible with product description . 6
A.8.3 Commentary on failure modes . 6
A.9 Commentary on evaluation of characteristic values for structural properties . 6
A.9.1 Commentary on structural properties . 6
A.9.2 Commentary on characteristic modulus of elasticity and shear modulus . 7
A.9.3 Commentary on characteristic values of strength . 7
A.10 Commentary on report . 7
Annex B (informative) Analytical models for determining characteristic properties of glued
laminated timber . 8
B.1 General . 8
B.2 Models . 8

© ISO 2015 – All rights reserved iii

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ISO/DIS 12122-3
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
ISO 12122-3 was prepared by Technical Committee ISO/TC 165, Timber Structures.
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
 Part 3: Glued laminated timber
 Part 4: Engineered wood products

iv © ISO 2015 – All rights reserved

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ISO/DIS 12122-3
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 glued laminated 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 the Standard is to be used in conjunction with ISO 12122-1 Timber Structures – Determination of
characteristic values – Part 1:Basic requirements.
This part of the Standard permits the evaluation of characteristic values on testing on commercial sized
specimens of glued laminated timber. Where the characteristic values are derived using calculations based on
laminate structural properties, this standard does not apply, but Annex B references other methods for
estimating characteristic values.
In some cases, characteristic values determined in accordance with this Standard may be modified to become
a design value.
The Standard has the following Annexes:
Annex A presents a commentary on the standard
Annex B presents information on analytical models for determining characteristic values of glued
laminated timber

© ISO 2015 – All rights reserved v

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DIS 12122-3

Timber Structures — Determination of characteristic values —
Part 3: Glued laminated timber
1 Scope
This International Standard gives methods of determination of characteristic values for a defined population of
glued laminated timber products, calculated from test values.
It presents methods for the determination of:
a) characteristic value of mean-based properties, and
th
b) characteristic value of 5 percentile-based properties.

NOTE An informative Annex to this standard gives information on methods that have been successfully used to
estimate the characteristic values of glued laminated timber products from properties of the laminates.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
This International Standard incorporates dated or undated reference, provisions and other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter.
For dated references, subsequent amendments to or revisions of any of these publications apply to this
International Standard only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication applies.
ISO 8375 Timber structures - Glued laminated timber - Test methods for determination of physical and
mechanical properties
ISO 12122-1 Timber structures – Determination of characteristic values – Part 1: Basic requirements
ISO 12578 Timber structures — Glued laminated timber — Component performance and production
requirements
3 Terms and definitions
For the purposes of this document, the relevant terms and definitions presented in ISO 12122-1 and ISO
12578 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 glued laminated timber may be included:
© ISO 2015 – All rights reserved 1

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ISO/DIS 12122-3
a) sources of raw material;
b) seasoning method (if seasoned);
c) grading or production method for laminates including presence and frequency of finger joints;
d) layup of the glued laminated product;
e) specification of adhesives, method of application and method of curing adhesives;
f) quality control measures;
g) secondary processing, such as preservative treatment, fire retardant treatment, profiling…, etc.; or
h) variations in the laminates (if any)

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.
NOTE See Clause 10 and ISO 12122-1 for reporting requirements on the sampling method.  The report should
indicate a response to each of the identified attributes of the reference population listed in compliance with Clause 5 in this
Standard or otherwise important to the description of the reference population.
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 glued laminated timber in the reference population.
NOTE 1 See Notes under the relevant clause in ISO 12122-1.
NOTE 2 ISO 12122-1 gives some guidance on selecting sample size.
7 Sample conditioning
The sample storage and testing environment shall reflect conditioning in accordance with the definition of the
reference population as indicated in ISO 12122-1. Due to the large size of glued laminated timber, it is
acceptable to test the sample at as-tested conditions provided that the results are adjusted in accordance with
Clause 8.2.
8 Test data
8.1 Test method
The test data shall be obtained from
a) ISO 8375 or
b) a standard test method appropriate for the glued laminated timber reference population provided
equivalency factors with ISO 8375 can be established.
NOTE 1 See Notes under the relevant clause in ISO 12122-1.
NOTE 2 Test methods involve many variables that will affect results including loading configuration and rates,
specimen positioning and measurement methods. The level of precision of these variables should be appropriate to the
objectives of the testing, and the adjustments required in Clause 8.2.
2 © ISO 2015 – All rights reserved

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ISO/DIS 12122-3
8.2 Test data compatible with product description
Where the characteristic value is applicab
...