ISO/TC 165/WG 10 - Characteristic values and design specifications

This document gives methods of determination of characteristic values for a defined population of mechanical connections between timber components, calculated from full scale test values. It presents methods for the determination of: a) slip modulus of mechanical connections; b) characteristic strength of connections subjected to either monotonic or cyclic loads. Glued connections are excluded from the scope of this document. NOTE 1 It is assumed that the failure mode is the same for all specimens in the sample. NOTE 2 When a small number of test results is available, ISO 12122‑6 is used for the determination of the mean and the 5th percentile values. NOTE 3 Informative commentary to the clauses of this document can be found in Annex A.

ISO 12122-6:2017 specifies methods of determination of characteristic values for a defined population of large components and assemblies, calculated from test values. It establishes two methods for the determination of characteristic values: a) direct calculation from test values; b) calculation from a resistance model, which is firstly calibrated from test results, including calculation of error terms.

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.

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.

ISO 12122-2:2014 gives methods for the determination of characteristic values for a defined population of sawn timber products, calculated from test values. It presents methods for the determination of: characteristic value of mean-based properties, and characteristic value of 5th percentile-based properties.

ISO 12122-1:2014 gives methods for the determination of characteristic values for a defined population of timber products, calculated from test values. It presents methods for the determination of: characteristic value of mean-based properties; and characteristic value of 5th percentile-based properties.