ISO 12122-4:2017
Timber structures — Determination of characteristic values — Part 4: Engineered wood products
ISO 12122-4:2017 gives methods of determination of characteristic values for a defined population of engineered wood products calculated from test values.
This document presents methods for the determination of
a) characteristic value of material properties, where the determined property is multiplied by a geometric parameter to give a component capacity or component stiffness, or
b) characteristic value of component properties directly, where the determined property is a component capacity or component stiffness.
ISO 12122-4:2017 presents methods for determination of
a) characteristic value of mean-based properties, and
b) characteristic value of 5th percentile-based properties.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Reference population
6 Sampling
6.1 Sampling method
6.2 Sample size
7 Sample conditioning
8 Test data
8.1 Test method
8.2 Test data compatible with product description
8.3 Failure modes
9 Evaluation of characteristic values for structural properties
9.1 Structural properties
9.2 Characteristic values of material properties
9.2.1 Characteristic modulus of elasticity and shear modulus
9.2.2 Characteristic bearing strength
9.2.3 Other characteristic values for strength based on the 5th percentile test value
9.3 Characteristic values of component properties
9.3.1 Characteristic stiffness
9.3.2 Characteristic bearing strength
9.3.3 Other characteristic capacities for strength based on the 5th percentile test value
10 Report
Annex A (informative) Commentary
Annex B (informative) Analytical models for determining characteristic properties of engineered wood products
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Reference population
6 Sampling
6.1 Sampling method
6.2 Sample size
7 Sample conditioning
8 Test data
8.1 Test method
8.2 Test data compatible with product description
8.3 Failure modes
9 Evaluation of characteristic values for structural properties
9.1 Structural properties
9.2 Characteristic values of material properties
9.2.1 Characteristic modulus of elasticity and shear modulus
9.2.2 Characteristic bearing strength
9.2.3 Other characteristic values for strength based on the 5th percentile test value
9.3 Characteristic values of component properties
9.3.1 Characteristic stiffness
9.3.2 Characteristic bearing strength
9.3.3 Other characteristic capacities for strength based on the 5th percentile test value
10 Report
Annex A (informative) Commentary
Annex B (informative) Analytical models for determining characteristic properties of engineered wood products
Bibliography