ISO 12579:2007

INTERNATIONAL ISO
STANDARD 12579
First edition
2007-10-01
Timber structures — Glued laminated
timber — Method of test for shear
strength of glue lines
Structures en bois — Bois lamellé-collé — Méthode d'essai de
cisaillement des plans de collage

Reference number
©
ISO 2007
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©  ISO 2007
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ii © ISO 2007 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Symbols and abbreviated terms . 2
5 Principle. 2
6 Test samples and test specimens. 2
6.1 Test samples . 2
6.2 Test specimens . 3
6.3 Alternative test specimens . 4
6.4 Adjustments to results for alternative test specimens. 5
6.5 Rectangular-prism test specimens from wide glulam timber members. 5
7 Apparatus . 6
7.1 Testing machine. 6
7.2 Shearing apparatus . 6
8 Procedure . 7
9 Results . 7
9.1 Calculation of shear stress. 7
9.2 Test report . 8

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
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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.
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.
ISO 12579 was prepared by Technical Committee ISO/TC 165, Timber structures.
iv © ISO 2007 – All rights reserved

Introduction
This International Standard was developed by TC 165 as a production quality-control test to be used for
structural glulam. It is meant to be used in conjunction with ISO 12578 and to be applied to each production
batch. The frequency of testing and the pass/fail criteria are detailed in ISO 12578. There is nothing, in
principle, that would prevent the test method from being applied to non-structural glulam.

INTERNATIONAL STANDARD ISO 12579:2007(E)

Timber structures — Glued laminated timber — Method of test
for shear strength of glue lines
1 Scope
This International Standard specifies a production quality-control test method for measuring the shear strength
of the glue line of glued laminated timber.
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.
ISO 12578, Timber structures — Glued laminated timber — Component performance and production
requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
glued laminated timber
glulam
structural member formed by bonding together timber laminations with the grain running essentially parallel
3.2
test sample
one or more test specimens taken from a press load or production lot detailed in ISO 12578
3.3
test specimen
test piece of rectangular prismatic or cylindrical fo
...