ISO/TR 19623:2019
Timber structures — Glued laminated timber — Assignment of glued laminated timber characteristic values from laminate properties
This document reviews the methodologies or analytical models that have been used to develop the strength and stiffness of structural glued laminated timber (glulam) from the characteristic properties of lumber laminations. The review is limited to the methodologies used in Europe, the USA, Australia/New Zealand, and Canada as they represent different fundamental philosophies in these areas. As a result, the methodologies are not intended to be combined unless there is clear understanding of the fundamental assumptions adopted by the respective methodologies.
NOTE Detailed assumptions used by the respective methodologies are available from the standards listed in the Bibliography.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 European methodologies
4.1 General
4.1.1 Timber
4.1.2 Related material properties
4.2 Verification from classification of standardised beam lay-ups and lamination properties of glued laminated timber
4.2.1 Properties of the boards
4.2.2 Strength of finger joints
4.2.3 Beam lay-up and strength class
4.3 Classification, verification according to method B from cross sectional layup and properties of boards and finger joints
4.3.1 Properties of the boards
4.3.2 Strength of finger joints
4.3.3 Determination of characteristic values for glued laminated timber
4.4 Verifications from full scale tests with glulam
4.4.1 Properties of the boards
4.4.2 Strength of finger joints
4.4.3 Strength, stiffness and density properties of glulam derived from testing
4.5 Resawn glulam
5 US methodologies
5.1 General
5.2 ASTM D3737
5.2.1 General
5.2.2 IK/IG analysis
5.3 Tension laminations
5.4 Volume factor
5.5 Other glulam properties
5.6 ANSI A190.1
5.7 Performance-based standard
6 Australian/New Zealand methodologies
6.1 Direct method
6.1.1 Tension tests of bonded lamination pairs
6.1.2 Major axis bending strength of glulam assemblies
6.1.3 Ratio of glulam beam bending to bonded lamination pair tension strength
6.1.4 Comparison of glulam assembly bending strength between EN 14080 and Formula (27) values
6.1.5 Depth and volume effects
6.1.6 Minor axis properties in bending also known as vertical glulam
6.1.7 Tension strength
6.1.8 Shear strength
6.1.9 Framework of AS/NZS 1328
6.2 AS/NZS 1328
6.2.1 Standard lamination requirements
6.2.2 Custom lamination requirements
6.2.3 Standard glulam and glued structural timber
6.2.4 Custom glulam and glued structural timber
6.3 AS/NZS 1328:2017, Appendix B
6.3.1 Determination of glulam major axis bending strength by computation
6.3.2 Beam bending stiffness (EI)c
6.3.3 Direct method for major axis bending and effective stiffness
6.3.4 Computer-based Monte Carlo method for bending strength
6.4 Direct tension and curvature stresses in bending
6.5 AS/NZS GL grades versus EN 14080 GLh grade bending strength values
7 Canadian methodologies
7.1 General
7.2 Laminating lumber
7.3 Manufacturing
7.4 Layup development
7.4.1 Mechanics-based model
7.4.2 New layup confirmation by full-scale testing
7.4.3 Data analysis
7.5 Acceptance of new layup combinations
Bibliography
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Related Information
Similar Standards
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AS/NZS 1328.1:1998
Glued laminated structural timber - Performance requirements and minimum production requirements -
AS/NZS 1328.1:1998 A1
Glued laminated structural timber - Performance requirements and minimum production requirements: Amendment 1 -
AS/NZS 1491:1996
Finger jointed structural timber
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AS/NZS 4364:2010
Timber - Bond performance of structural adhesives
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 European methodologies
4.1 General
4.1.1 Timber
4.1.2 Related material properties
4.2 Verification from classification of standardised beam lay-ups and lamination properties of glued laminated timber
4.2.1 Properties of the boards
4.2.2 Strength of finger joints
4.2.3 Beam lay-up and strength class
4.3 Classification, verification according to method B from cross sectional layup and properties of boards and finger joints
4.3.1 Properties of the boards
4.3.2 Strength of finger joints
4.3.3 Determination of characteristic values for glued laminated timber
4.4 Verifications from full scale tests with glulam
4.4.1 Properties of the boards
4.4.2 Strength of finger joints
4.4.3 Strength, stiffness and density properties of glulam derived from testing
4.5 Resawn glulam
5 US methodologies
5.1 General
5.2 ASTM D3737
5.2.1 General
5.2.2 IK/IG analysis
5.3 Tension laminations
5.4 Volume factor
5.5 Other glulam properties
5.6 ANSI A190.1
5.7 Performance-based standard
6 Australian/New Zealand methodologies
6.1 Direct method
6.1.1 Tension tests of bonded lamination pairs
6.1.2 Major axis bending strength of glulam assemblies
6.1.3 Ratio of glulam beam bending to bonded lamination pair tension strength
6.1.4 Comparison of glulam assembly bending strength between EN 14080 and Formula (27) values
6.1.5 Depth and volume effects
6.1.6 Minor axis properties in bending also known as vertical glulam
6.1.7 Tension strength
6.1.8 Shear strength
6.1.9 Framework of AS/NZS 1328
6.2 AS/NZS 1328
6.2.1 Standard lamination requirements
6.2.2 Custom lamination requirements
6.2.3 Standard glulam and glued structural timber
6.2.4 Custom glulam and glued structural timber
6.3 AS/NZS 1328:2017, Appendix B
6.3.1 Determination of glulam major axis bending strength by computation
6.3.2 Beam bending stiffness (EI)c
6.3.3 Direct method for major axis bending and effective stiffness
6.3.4 Computer-based Monte Carlo method for bending strength
6.4 Direct tension and curvature stresses in bending
6.5 AS/NZS GL grades versus EN 14080 GLh grade bending strength values
7 Canadian methodologies
7.1 General
7.2 Laminating lumber
7.3 Manufacturing
7.4 Layup development
7.4.1 Mechanics-based model
7.4.2 New layup confirmation by full-scale testing
7.4.3 Data analysis
7.5 Acceptance of new layup combinations
Bibliography