prEN 14080
(Main)Timber structures - Glued laminated timber and glued laminated solid timber - Requirements
Timber structures - Glued laminated timber and glued laminated solid timber - Requirements
This European Standard specifies the requirements for glued laminated timber for use in load bearing structures. It also specifies the requirements for large finger joints in the glued laminated timber. This European Standard specifies the requirements for glued laminated timber produced from untreated timber or from timber treated against biological attack.
Holzbauwerke - Brettschichtholz und Balkenschichtholz - Anforderungen
Diese Europäische Norm legt die Leistungsanforderungen und die Mindestanforderungen an die Herstellung von Brettschichtholz, Balkenschichtholz, Verbundbauteilen aus Brettschichtholz und Universal-Keilzinkenverbindungen in Brettschichtholz zur Verwendung im Hochbau und im Brückenbau fest.
Die Anforderungen müssen ergänzt werden, um besondere Herstellungsbedingungen, Baustoffe oder Anforderungen an die Funktion zu berücksichtigen.
Diese Europäische Norm gilt für Brettschichtholz aus bestimmten aufgelisteten Nadelholzarten oder aus Pappel mit mindestens zwei Lamellen mit einer Dicke zwischen 6 mm und 45 mm.
Diese Europäische Norm gilt für Balkenschichtholz aus bestimmten aufgelisteten Nadelholzarten oder aus Pappel mit zwei oder drei Lamellen mit einer Dicke über 45 mm, jedoch weniger als oder gleich 85 mm. Die maximale Höhe von Balkenschichtholz beträgt 240 mm, die maximale Breite beträgt 280 mm.
Diese Europäische Norm gilt für Verbundbauteile aus Brettschichtholz mit massivem rechteckigem Querschnitt.
Die Festlegungen dieser Europäischen Norm gelten für Universal-Keilzinkenverbindungen in Bauteilen aus Brettschichtholz mit einer Zinkenlänge von mindestens 45 mm.
Diese Europäische Norm legt Anforderungen an Brettschichtholz aus unbehandeltem Holz oder aus Holz, das gegen biologischen Befall behandelt wurde, fest. Mit Feuerschutzmittel behandeltes Brettschichtholz ist nicht Gegenstand dieser Norm.
Structures en bois - Bois lamellé-collé et bois massif reconstitué - Exigences
La présente Norme européenne spécifie les exigences de performance et les exigences minimales relatives à la fabrication de bois lamellé-collé, de bois massif reconstitué, d'éléments collés constitués de composants en bois lamellé-collé et d'aboutages à entures de grandes dimensions dans des éléments en bois lamellé-collé, destinés à être utilisés dans les bâtiments et les ponts.
Ces exigences devront être complétées pour prendre en compte des conditions particulières de fabrication, des matériaux particuliers ou des exigences fonctionnelles particulières.
La présente Norme européenne est applicable au bois lamellé-collé fabriqué à partir de certaines essences de bois de résineux énumérées ou de peuplier, constitué de deux lamelles ou plus, ayant une épaisseur comprise entre 6 mm et 45 mm.
La présente Norme européenne est applicable au bois massif reconstitué fabriqué à partir de certaines essences de bois de résineux énumérées ou de peuplier, constitué de deux ou trois lamelles ayant une épaisseur supérieure à 45 mm et inférieure ou égale à 85 mm. La hauteur maximale du bois massif reconstitué est de 240 mm et sa largeur maximale de 280 mm.
La présente Norme européenne est applicable aux éléments collés constitués de composants en bois lamellé-collé de sections transversales rectangulaires massives.
Les spécifications de la présente Norme européenne sont valables pour les aboutages à entures de grandes dimensions réalisés dans des éléments en bois lamellé-collé, avec une longueur d'enture d'au moins 45 mm.
La présente Norme européenne spécifie les exigences relatives aux éléments collés produits à partir de bois non traité ou de bois traité contre les attaques biologiques. Les éléments collés traités par des produits ignifuges ne sont pas couverts.
Lesene konstrukcije - Lepljeni lamelirani les in lepljeni lamelirani brunasti les - Zahteve
General Information
Relations
Overview
prEN 14080 - "Timber structures - Glued laminated timber and glued laminated solid timber - Requirements" is a CEN draft European Standard that sets out performance, production and conformity requirements for glued laminated timber (glulam) and glued laminated solid timber intended for load‑bearing structures. The standard covers products made from untreated timber and timber treated against biological attack, and includes specific provisions for large finger joints and for treated timber.
Key topics and technical requirements
- Scope & definitions: Terms, symbols and the intended use of glulam in structural applications.
- Material performance: Requirements for timber species, strength grading, density, stiffness and bonding performance.
- Adhesives: Allowed adhesive types (phenolic, aminoplastic, polyurethane, EPI/EMI, epoxy), with specific performance and gap‑filling criteria.
- Finger joints: Geometry, strength verification and production rules for small and large finger joints in lamellas and components.
- Lamella and lay‑up verification: Methods to verify member strength/stiffness - from classification of lamellas, standardized lay‑ups, calculations based on lamella and joint properties, and full‑scale tests.
- Durability & safety: Requirements covering durability against biological attack, reaction to fire (Euroclasses), and formaldehyde emission (Annex A).
- Quality & production: Minimum production requirements (staff, facilities, equipment), bonding, curing, dimensional tolerances and moisture control at bonding.
- Conformity & FPC: Initial type testing, sampling, factory production control (FPC) and marking/labeling requirements for CE/national implementation.
- Test methods: Normative testing procedures for adhesives, delamination, long‑term sustained load and cyclic climate tests (Annex C).
Applications and who uses it
- Structural timber manufacturers producing glulam and glued laminated solid timber.
- Design engineers, architects and specifiers who select engineered timber for beams, columns, trusses and curved members.
- Construction contractors and fabricators responsible for manufacture, assembly and on‑site handling of glulam elements.
- Certification bodies and testing laboratories performing type testing, FPC audits and conformity assessment.
- Regulators and standards committees applying European reaction‑to‑fire and emission rules.
Related standards and references
- Draft prepared by CEN/TC 124; intended to supersede EN 14080:2005.
- Contains normative annexes on formaldehyde classes, reaction to fire (Euroclass) and adhesive test methods.
- Users should consult national implementation documents and complementary CEN standards on timber grading, adhesives and fire performance for full compliance.
Keywords: prEN 14080, glued laminated timber, glulam, finger joints, adhesives, strength grading, factory production control, formaldehyde, reaction to fire.
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2009
Lesene konstrukcije - Lepljeni lamelirani les in lepljeni lamelirani brunasti les -
Zahteve
Timber structures - Glued laminated timber and glued laminated solid timber -
Requirements
Holzbauwerke - Brettschichtholz und Balkenschichtholz - Anforderungen
Structures en bois - Bois lamellé-collé et bois massif reconstitué - Exigences
Ta slovenski standard je istoveten z: prEN 14080
ICS:
79.060.99 'UXJHOHVQHSORãþH Other wood-based panels
91.080.20 Lesene konstrukcije Timber structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2009
ICS Will supersede EN 14080:2005
English Version
Timber structures - Glued laminated timber and glued laminated
solid timber - Requirements
Structures en bois - Bois lamellé collé et bois massif Holzbauwerke - Brettschichtholz und Balkenschichtholz -
reconstitué - Exigences Anforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 124.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14080:2009: E
worldwide for CEN national Members.
Contents Page
Foreword .6
1 Scope .8
2 Normative references .8
3 Terms and definitions .9
4 Symbols . 14
5 Performance requirements . 16
5.1 Timber . 16
5.1.1 Timber species . 16
5.1.2 Strength grading . 16
5.2 Adhesives . 16
5.2.1 General . 16
5.2.2 Phenolic and aminoplastic adhesives . 17
5.2.3 Moisture curing one component polyurethane adhesives . 17
5.2.4 Emulsion polymer isocyanate adhesives . 17
5.2.5 Epoxy resin adhesives . 17
5.2.6 Additional requirements for gap filling adhesives . 18
5.3 Finger joints in lamellas . 18
5.3.1 General . 18
5.3.2 Strength of finger joints in lamellas. 18
5.4 Lamellas . 18
5.4.1 General . 18
5.4.2 Bonding strength of glue lines . 18
5.5 Strength, stiffness and density properties of glued laminated timber . 19
5.5.1 General . 19
5.5.2 Verification from classification of lamella properties for glued laminated timber
comprising two or three lamellas. 20
5.5.3 Verification from classification of standardised beam lay ups and lamella properties for
glued laminated timber comprising more than three lamellas . 20
5.5.4 Verifications from calculations based on the properties of the lamellas and the finger
joints . 22
5.5.5 Verifications from tests with glued laminated timber with two or three lamellas . 24
5.5.6 Verifications from tests with glued laminated timber comprising more than three lamellas . 24
5.6 Strength-, stiffness- and density- properties of glued laminated solid timber . 25
5.6.1 General . 25
5.6.2 Verification from classification of lamella properties . 25
5.6.3 Verifications from tests with glued laminated solid timber . 26
5.7 Glued members made of glulam-components . 26
5.7.1 General . 26
5.7.2 Bonding strength of glue lines between glulam components . 26
5.8 Large finger joints. 27
5.8.1 General . 27
5.8.2 Bending strength of large finger joints . 27
5.9 Durability against biological attack . 27
5.10 Reaction to fire . 27
5.11 Formaldehyde emission . 27
5.12 Deviation in sizes . 27
5.12.1 Maximum permissible deviations . 27
5.12.2 Corrected sizes and moisture deformation factor . 29
6 Minimum production requirements . 29
6.1 Staff . 29
6.2 Production and storage facilities . 30
6.2.1 General . 30
6.2.2 Facilities for drying and storage of timber . 30
6.2.3 Facilities for processing and storage of adhesives . 30
6.2.4 Facilities for other processing and curing. 30
6.3 Equipment . 30
6.4 Finger joints in lamellas . 30
6.4.1 Finger joint geometry . 30
6.4.2 Knots and local grain deviation . 31
6.4.3 Moisture content at bonding . 31
6.4.4 Application of the adhesive . 31
6.4.5 Production of finger joints in lamellas . 32
6.4.6 Cramping . 32
6.4.7 Curing . 33
6.5 Bonding of lamellas . 33
6.5.1 Permissible lamella sizes and radius of curvature . 33
6.5.2 Lamellas made of two boards side by side . 34
6.5.3 Grooves in lamellas . 34
6.5.4 Orientation of lamellas in the cross section . 34
6.5.5 Moisture content at bonding . 35
6.5.6 Planing of lamellas . 35
6.5.7 Adhesive application . 35
6.5.8 Glue line thickness . 35
6.5.9 Cramping . 36
6.5.10 Curing . 36
6.6 Glued members made of glulam-components . 36
6.6.1 Moisture content at bonding . 36
6.6.2 Adhesive application . 36
6.6.3 Cramping . 37
6.6.4 Glue line thickness . 37
6.6.5 Curing . 37
6.7 Large finger joints . 38
6.7.1 Moisture content at bonding . 38
6.7.2 Finger joint geometry . 38
6.7.3 Cutting of the fingers . 38
6.7.4 Adhesive application . 38
6.7.5 Cramping . 38
6.7.6 Glue line thickness . 39
6.7.7 Curing . 39
7 Evaluation of conformity . 39
7.1 General . 39
7.2 Inititial type testing and assessment . 39
7.2.1 General . 39
7.2.2 Characteristics . 40
7.2.3 Sampling, testing and conformity criteria . 40
7.3 Factory production control (FPC) . 43
7.3.1 General . 43
7.3.2 FPC requirements for all manufacturers . 44
7.3.3 Manufacturer-specific FPC system requirements . 46
8 Marking and labelling . 46
Annex A (normative) Formaldehyde classes . 48
A.1 General . 48
A.2 Initial classification and factory production control . 48
A.3 Formaldehyde classes . 48
Annex B (normative) Reaction to fire: Euroclass without the need for further testing . 50
Annex C (normative) Test methods for adhesives . 51
C.1 General . 51
C.2 Additional delamination and block shear tests for gap filling adhesives. 51
C.3 Long-term sustained load test at cyclic climate conditions with specimens loaded
perpendicular to the glue line . 51
C.3.1 General description . 51
C.3.2 Production of the specimens . 51
C.3.3 Test procedure and climate conditions . 52
C.3.4 Requirements . 53
C.4 Delamination test for finger joints in lamellas . 53
C.4.1 Production of the specimen . 53
C.4.2 Testing . 54
C.4.3 Requirements . 54
Annex D (normative) Adhesives for the production of glued members . 55
D.1 General . 55
D.2 List of adhesives . 55
Annex E (normative) Delamination test of glue lines . 61
E.1 Principle . 61
E.2 Apparatus . 61
E.2.1 Pressure vessel. 61
E.2.2 Drying duct . 61
E.2.3 Balance . 61
E.2.4 Metal wedge and hammer . 61
E.3 Preparation of test pieces . 61
E.4 Procedures . 62
E.4.1 General . 62
E.4.2 Measurement and evaluation of delamination . 62
E.4.3 Test cycle for method A . 63
E.4.4 Test cycle for method B . 63
E.5 Results . 64
E.5.1 General . 64
E.5.2 Total delamination . 64
E.5.3 Maximum delamination . 64
E.6 Report . 65
Annex F (normative) Shear test of glue lines . 66
F.1 Principle . 66
F.2 Apparatus . 66
F.2.1 Testing machine. 66
F.2.2 Shearing tool . 66
F.3 Preparation of test pieces . 67
F.4 Sampling . 68
F.5 Marking . 69
F.6 Procedure . 70
F.7 Results . 70
F.8 Report . 71
Annex G (normative) Testing of finger joints . 72
G.1 Sampling . 72
G.1.1 General . 72
G.1.2 For Initial type testing . 72
G.1.3 For Factory production control . 72
G.2 Testing . 72
G.2.1 General . 72
G.2.2 For Initial type testing . 72
G.3 Compliance criteria. 72
G.3.1 For Initial type testing . 72
G.3.2 For Factory production control . 73
G.4 Evaluation and report . 73
Annex H (normative) Bending tests with glued laminated timber and glued laminated solid timber . 74
H.1 Sampling. 74
H.2 Testing . 74
H.3 Evaluation and report . 74
Annex I (normative) Drill cores from glued members made of glulam-components . 75
Annex J (normative) Testing of large finger joints . 76
J.1 Sampling. 76
J.2 Testing . 76
J.3 Evaluation and report . 76
J.4 Compliance criteria . 76
Annex K (normative) Measurement of moisture content . 77
Annex L (normative) Equipment. 78
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU
Construction Products Directive . 79
Foreword
This document (prEN 14080:2009) has been prepared by Technical Committee CEN/TC 124 “Timber
structures”, the secretariat of which is held by SFS.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14080:2005.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EC Directive.
For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this document.
This standard supersedes the following standards:
EN 385: 2001-10
EN 386: 2001-10
EN 387: 2001-10
EN 390: 1994-11
EN 391: 2002-04
EN 392: 1996-04
EN 1194: 1999-04
EN 14080: 2005-06
The content of the standards mentioned above has been changed considerably. The following list shows the
relevant changes and amendments.
The standards mentioned above have been merged.
Glued members made of glulam-components and glued laminated solid timber have been included.
The scope has been limited to glulam made of certain coniferous timber species listed in this standard
and poplar.
For moisture curing one-component polyurethane adhesives reference is now made to EN 15425 and
EN 15416-5.
Requirements for EPI- and Epoxy resin adhesives and for gap-filling adhesives are given.
Rules for the splitting of glulam by length have been introduced.
A uniform denomination for lamella strength classes has been included.
New values for tension and compression strength perpendicular to the grain, for shear strength and shear
modulus, modulus of elasticity parallel and perpendicular to the grain are given for glued laminated timber.
Values for rolling shear strength and modulus have been introduced.
With respect to durability against biological attack reference has been made to prEN 15228: 2007.
Maximum permissible deviations for curved members are given.
The performance requirements for finger joints in lamellas have been changed.
Requirements for the machinery for the separate application of resin and hardener have been introduced.
The rules for lamellas side by side and for grooves in lamellas have been changed.
The required cramping pressure for large finger joints has been changed.
The evaluation of conformity section and the Annex ZA has been changed according to the relevant
guidance papers of the European commission.
The rules for marking and labelling have been adopted to the changes mentioned above.
1 Scope
This European Standard lays down the performance requirements and minimum requirements for the
production of glued laminated timber, glued laminated solid timber, glued members made of glulam
components and large finger joints in glued laminated timber members for use in buildings and bridges.
The requirements will need to be supplemented to take into consideration special production conditions,
materials or functional requirements.
This European standard is applicable for glued laminated timber made of certain listed coniferous timber
species or poplar consisting of two or more lamellas having a thickness between 6 mm and 45 mm.
This European standard is applicable for glued laminated solid timber made of certain listed coniferous timber
species or poplar consisting of two or three lamellas having a thickness greater than 45 mm and less than or
equal 85 mm. The maximum height of the glued laminated solid timber is 240 mm, the maximum width
280 mm.
This European Standard is applicable for glued members made of glulam-components having solid
rectangular cross sections.
The specifications of this European standard are valid for large finger joints in glued laminated timber
members with a finger length of at least 45 mm.
This European Standard lays down the requirements for glued members produced from untreated timber or
from timber treated against biological attack. Glued members treated with fire retardants are not covered.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from 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
European Standard only when incorporated in it by amendment or revision.
For undated references the latest edition of the publication referred to applies (including amendments).
EN 301, Adhesives, phenolic and amino plastic, for load-bearing timber structures — Classification and
performance requirements
EN 302-1, Adhesives for load-bearing timber structures — Test methods — Part 1: Determination of bond
strength in longitudinal tensile shear strength
EN 302-2, Adhesives for load-bearing timber structures — Test methods — Part 2: Determination of
resistance to delamination
EN 302-3, Adhesives for load-bearing timber structures — Test methods — Part 3: Determination of the effect
of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength
EN 302-4, Adhesives for load-bearing timber structures — Test methods — Part 4: Determination of the effect
of wood shrinkage on the shear strength
EN 302-6, Adhesives for load-bearing timber structures — Test methods — Part 6: Determination of the
conventional pressing time
EN 338: 2003, Structural timber — Strength-classes
EN 350-1, Durability of wood and wood-based products — Natural durability of solid wood — Part 1: Guide to
the principles of testing and classification of the natural durability of wood
EN 350-2, Durability of wood and wood-based products — Natural durability of solid wood — Part 2: Guide to
natural durability and treatability of selected wood species of importance in Europe
EN 384, Structural timber – Determination of characteristic values of mechanical properties and density
EN 408, Timber structures — Structural and glued laminated timber — Determination of some physical and
mechanical properties
EN 717-1, Wood-based panels — Determination of formaldehyde release — Part 1: Formaldehyde emission
by the chamber method
EN 1995-1-1, Eurocode 5 — Design of timber structures — Part 1-1: General - Common rules and rules for
buildings
EN 13183-2, Moisture content of a piece of sawn timber — Part 2: Estimation by electrical resistance method
EN 13183-3, Moisture content of a piece of sawn timber — Part 2: Estimation by capacitance method
EN 13238, Reaction to fire tests for building products — Conditioning procedures and general rules for
selection of substrates
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using
test data from reaction to fire tests
EN 14081-1, Timber structures — Strength graded structural timber with rectangular cross section — Part 1:
General requirements
EN 14358, Timber structures — Fasteners and wood-based products — Calculation of characteristic 5-
percentile values and acceptance criteria for a sample
prEN 15228: 2007, Structural timber — Structural timber preservative treated against biological attack
EN 15416-5, Adhesives for load bearing timber structures with the exception of phenolic and amino plastic
adhesives — Test methods — Part 5: Determination of conventional pressing time
EN 15425, Adhesives — One component polyurethane adhesives for load bearing timber structures —
Classification and performance requirements
ISO 554, Standard atmospheres for conditioning and/or testing — Specifications
3 Terms and definitions
For the purpose of this European standard the following terms and definitions apply.
3.1
actual size
measured size of a member at a related measured moisture content
3.2
combined glued laminated timber
glued laminated timber with a cross section comprising inner and outer lamellas of different strength classes
or strength profiles
3.3
corrected size
actual size of a member corrected to the reference moisture content
3.4
delamination length
sum of the lengths of delaminated glue lines on both end-grain surfaces of each test piece
3.5
finger angle
inclination of the fingers of a finger joint (see Figure 1)
3.6
finger joint
self locating end joint formed by machining a number of similar, tapered, symmetrical fingers in the ends of
timber members, which are formed by a finger joint cutter and then bonded together (see Figure 1)
3.7
finger length
distance between the finger base and the tip of the finger, measured along the centre line of the finger (see
Figure 1)
Key
l finger length
p pitch
α finger angle
l tip gap
t
b tip width
t
Figure 1 — Typical profile of finger joint
3.8
gap filling adhesive
adhesive that fulfils the requirements for glue lines in lamellas and the additional requirements for glue line
thicknesses up to 2 mm
3.9
glued laminated timber
Glulam
structural member composed by at least two timber lamellas bonded together parallel to the axis of the
lamellas (see Figure 2), whose lamellas are made of coniferous timber or poplar, being untreated or treated
against biological attack and having thicknesses between 6 mm and 45 mm
Figure 2 — Glued laminated timber
NOTE Due to planing of the glued laminated timber member the outermost lamellas may have reduced thicknesses
compared to the inner lamellas.
3.10
glued laminated solid timber
structural timber member composed by two or three lamellas bonded together parallel to the axis of the
lamellas (see Figure 3), whose lamellas are made of coniferous timber or poplar, being untreated or treated
against biological attack, having the same strength class or profile and a lamella thickness greater than
45 mm and not more than 85 mm
Figure 3 — Glued laminated solid timber
NOTE Due to planing of the glued laminated solid timber member the outermost lamellas may have reduced
thicknesses compared to the inner lamella.
3.11
glued members made of glulam-components
member made of glulam-components glued together using a gap filling adhesive, and having a solid
rectangular cross-section
Key
1 Glulam-component 1
2 Glulam-component 2
n Glulam-component n
Figure 4 — Glued member made of glulam-components
3.12
homogeneous glued laminated timber
glued laminated timber with a cross section where all lamellas are of the same strength class or strength
profile
3.13
large finger joint
finger joint through the full cross-sectional area at the ends of glued laminated timber members bonded
° °
together at any angle between 90 and 180 (see Figure 5)
Key
1 Direction of grain
β angle between the large finger joint and the grain direction
Figure 5 — Large finger joints in a beam and in frame corners
3.14
longitudinal warping
maximum gauge measured over a length of 2000 mm
3.15
maximum delamination length
largest delamination length in one glue line in the test piece
3.16
mean moisture content
mean value of the moisture content of glued laminated timber estimated from at least two measurements (see
Annex J)
3.17
minimum mean density
required value for the weighted mean density of a glued laminated timber member at a reference moisture
content of 12 % used for the classification of the reaction to fire (according to Annex B)
3.18
moisture content
amount of water present in timber, expressed as percentage of oven dry mass
3.19
pitch
distance between fingers, measured from centre to centre (see Figure 1)
3.20
reference moisture content
moisture content at which target sizes are established
NOTE For glued laminated timber and glued laminated solid timber the reference moisture content is 12 %.
3.21
relative tip gap
ratio between the distance between finger tip and the opposite slot base in a bonded finger joint and the finger
length (see Figure 1)
3.22
rolling shear
stress were both stress components are perpendicular to the grain
3.23
strength-profile
a set of characteristic strength and stiffness properties
3.24
target size
size of the glued laminated timber member at the reference moisture content
3.25
tip width
distance between finger faces, measured at the tip of the finger (see Figure 1)
3.26
total delamination length
sum of all delamination lengths of all glue lines in the test piece
3.27
weakening factor
ratio between tip width and pitch (see Figure 1)
3.28
wood failure
rupture in or between wood fibres
3.29
wood failure percentage
percentage of the wood failure area in relation to the total sheared area
4 Symbols
Main symbols
A area, in mm ;
b width of cross-section, in mm;
b tip width, in mm, see Figure 1;
t
d diameter, in mm;
e relative tip gap;
E modulus of elasticity, in N/mm ;
f strength, in N/mm ;
F ultimate load in N;
u
G shear modulus, in N/mm ;
h depth of cross-section, in mm;
h depth of a bending specimen or width of a tension specimen, in mm
k factor;
k statistical factor;
k moisture deformation factor;
k ratio between flatwise and edgewise characteristic bending strength;
f
l length, in mm;
l finger length in mm, see Figure 1;
l actual size, in mm;
a
l corrected size, in mm;
cor
l maximum delamination length, in mm;
max,delam
l length of one glue line, normally the width b, in mm;
glueline
l tip gap in mm, see Figure 1;
t
l total delamination length, in mm;
tot,delam
l entire length of glue lines on the two end-grain surfaces of each test piece, in mm;
tot,glueline
n number of lamellas;
lam
p pitch, in mm, see Figure 1;
r radius of curvature, in mm,
t lamella thickness, in mm;
u moisture content, in %;
u actual moisture content, in %
a
u reference moisture content, in %;
ref
v weakening factor of a finger joint;
α finger angle, in degree, see Figure 1;
β angle between the large finger joint and the grain direction, see Figure 5;
ρ density, in kg/m ;
Subscripts
c compression;
dc declared value;
g properties of glued laminated timber or glued laminated solid timber;
h hight effect;
j properties of finger joints in lamellas;
k characteristic;
l properties of lamellas;
m bending;
mean mean value;
min minimal;
r rolling shear;
t tension;
lfj properties of large finger joints;
v shear;
0 parallel to the grain;
05 5 %-percentile;
oSIST prEN 14080:2
...
Frequently Asked Questions
prEN 14080 is a draft published by the European Committee for Standardization (CEN). Its full title is "Timber structures - Glued laminated timber and glued laminated solid timber - Requirements". This standard covers: This European Standard specifies the requirements for glued laminated timber for use in load bearing structures. It also specifies the requirements for large finger joints in the glued laminated timber. This European Standard specifies the requirements for glued laminated timber produced from untreated timber or from timber treated against biological attack.
This European Standard specifies the requirements for glued laminated timber for use in load bearing structures. It also specifies the requirements for large finger joints in the glued laminated timber. This European Standard specifies the requirements for glued laminated timber produced from untreated timber or from timber treated against biological attack.
prEN 14080 is classified under the following ICS (International Classification for Standards) categories: 79.060.99 - Other wood-based panels. The ICS classification helps identify the subject area and facilitates finding related standards.
prEN 14080 has the following relationships with other standards: It is inter standard links to EN 14080:2005. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
prEN 14080 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC; Standardization Mandates: M/112. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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La norme prEN 14080 représente un cadre essentiel pour les structures en bois, notamment en ce qui concerne le bois lamellé-collé et le bois lamellé-collé massif. Elle définit clairement les exigences relatives à l'utilisation de ces matériaux dans des structures portantes, ce qui en fait un document crucial pour les ingénieurs et les architectes œuvrant dans le domaine de la construction durable. L'un des principaux atouts de cette norme est son approche comprehensive concernant les joints à doigts larges dans le bois lamellé-collé. En définissant des critères stricts pour ces joints, prEN 14080 assure non seulement la stabilité structurelle, mais également la longévité des constructions. La norme reconnaît également l'importance du traitement du bois contre les attaques biologiques, en fournissant des spécifications pour le bois non traité ainsi que pour le bois traité, garantissant ainsi sa performance dans divers environnements. La portée de la norme prEN 14080 s'avère particulièrement pertinente dans un contexte où les préoccupations liées à la durabilité et à la sécurité des constructions sont de plus en plus présentes. En intégrant des exigences sur les matériaux et leurs traitements, elle garantit que les structures réalisées en bois lamellé-collé répondent aux défis modernes de l'architecture tout en respectant les normes de sécurité. En somme, la norme prEN 14080 est un document fondamental qui offre des lignes directrices claires et rigoureuses. Sa capacité à traiter à la fois les exigences de performance et les préoccupations environnementales en fait un outil indispensable pour l'industrie de la construction et la mise en œuvre de structures en bois innovantes et durables.
Die prEN 14080 ist ein entscheidendes Dokument, das spezifische Anforderungen für Brettschichtholz und Brettschichtholz aus massiven Holzstücken definiert, die in tragenden Konstruktionen eingesetzt werden. Diese europäische Norm legt die Grundlagen für die Verwendung von verleimtem Holz fest und stellt sicher, dass die strukturellen Eigenschaften und Sicherheitsstandards erfüllt werden. Ein wichtiger Aspekt der prEN 14080 ist die klare Definition der Anforderungen an große Fingerverbindungen im verleimten Holz, was für die Festigkeit und die Integrität von Konstruktionen unerlässlich ist. Diese spezifischen Vorgaben tragen dazu bei, dass die Qualität und die Leistung der verwendeten Materialien gewährleistet sind. Ein weiterer Vorteil dieser Norm ist die Berücksichtigung von unbehandeltem Holz sowie Holz, das gegen biologische Angriffe behandelt wurde. Dies erhöht nicht nur die Flexibilität bei der Materialwahl, sondern stellt auch sicher, dass die Anforderungen an Umweltschutz und Nachhaltigkeit eingehalten werden. Die Relevanz der prEN 14080 erstreckt sich über den gesamten Bau- und Holzsektor, da sie dazu beiträgt, einen einheitlichen Standard für die Qualität von Brettschichtholz zu schaffen. Dies fördert die Sicherheit in Bauprojekten und unterstützt die Fachleute dabei, die besten Praktiken im Umgang mit strukturellem Holz einzuhalten. Insgesamt bietet die prEN 14080 eine umfassende Grundlage für die Verwendung von verleimtem Holz in tragenden Strukturen und berücksichtigt wesentliche Aspekte, die für Qualität, Sicherheit und Langlebigkeit von Bedeutung sind.
EN 14080은 하중을 지탱하는 구조물에 사용되는 접착 라미네이트 목재에 대한 요구 사항을 규정하는 유럽 표준으로, 목재 구조물 설계 및 시공에 있어 필수적인 기준을 제공합니다. 이 표준은 비처리 목재 또는 생물학적 공격으로부터 처리된 목재로부터 생산된 접착 라미네이트 목재에 대한 요구 사항을 명확히 정의하고 있으며, 이는 다양한 환경에서의 내구성과 안전성을 보장합니다. 특히, EN 14080에서는 대형 핑거 조인트에 대한 요구 사항도 포함되어 있어, 접착 라미네이트 목재의 연결 부분에 대한 강도 및 신뢰성을 확보합니다. 이로 인해 구조물이 전체적으로 안정적이고 안전하게 설계될 수 있도록 지원합니다. 강점으로는, EN 14080이 시장에서의 일관성을 촉진하고, 품질 표준을 유지하여 사용자가 동일한 기준의 목재 제품을 쉽게 이해하고 선택할 수 있도록 돕는 점이 있습니다. 이러한 표준화는 또한 건축자재의 효율적인 사용과 효과적인 설계를 가능하게 하여, 궁극적으로 비용 절감과 시간 단축을 가져옵니다. EN 14080의 중요성은 각기 다른 지역의 건축 규제와 요구사항을 충족하는 데 있으며, 이러한 표준에 따라 생산된 접착 라미네이트 목재는 건축물의 구조적 안전성을 높이는 데 기여하여 보다 지속 가능한 건축 생태계를 구축하는 데 필수적입니다. 따라서, 이 표준은 목재 구조물의 발전에 있어 핵심적인 역할을 수행하고 있습니다.
The standard prEN 14080 titled "Timber structures - Glued laminated timber and glued laminated solid timber - Requirements" serves as a comprehensive guideline for the manufacture and use of glued laminated timber in load-bearing structures. Its primary scope includes detailed specifications not only for the glued laminated timber itself but also for the application of large finger joints within these structures. This breadth ensures that users of glued laminated timber can rely on consistent performance and safety standards across the board. One of the key strengths of prEN 14080 lies in its versatility; the standard accommodates both untreated timber and timber that has undergone treatment against biological attacks. This aspect is particularly relevant in providing solutions that enhance durability, thereby broadening the potential applications of glued laminated timber in various environments, including those with specific biological threats. By tackling these diverse applications and potential challenges, the standard plays a crucial role in promoting the safe and sustainable use of timber in construction. Moreover, the standard is aligned with European safety regulations, ensuring that all products meet stringent quality criteria which ultimately contribute to the reliability and performance of glued laminated timber in structural applications. This alignment enhances the standard's relevance in the current market where safety and durability are paramount. The clarity and thoroughness of the requirements specified in prEN 14080 make it an indispensable resource for manufacturers, designers, and engineers working with timber structures. The attention to detail regarding the properties and performance of glued laminated timber, alongside guidance for construction and jointing techniques, underscores its relevance in today's construction industry. Overall, prEN 14080 not only fosters quality assurance but also advances the broader adoption of timber as a reliable building material.
prEN 14080は、荷重を支持する構造に使用される接着積層木材に関する重要な欧州標準です。この標準は、未処理の木材または生物攻撃に対して処理された木材から製造される接着積層木材の要件を明示しており、品質と性能の向上に寄与しています。特に、大型フィンガージョイントに関する要件も規定しており、高強度の接合を実現することで、構造的な安全性を確保しています。 この標準の強みは、厳格な試験方法と基準を設けることにより、接着積層木材の品質を保証し、施工業者や設計者にとって信頼性の高い指針を提供している点にあります。また、接着積層木材は軽量でありながら強度が高く、環境への負荷を軽減するため持続可能な建築資材としての重要性も増しています。 さらに、prEN 14080は、さまざまな規模のプロジェクトに対応できる柔軟性を持ちつつ、欧州市場における一般的な要件を含んでいるため、国際的な貿易にも適した仕様となっています。このように、接着積層木材の使用推進は、持続可能で安全な建築物の構築に貢献し、それにより長期的に見て利便性の高い基準となります。
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