LY/T 3144-2019Timber structures -- Testing of joints made with mechanical fasteners -- Requirements for wood density (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard uses the translation method equivalent to ISO 8970.:2010 "Wood Structure-Metal Fastener Connection Test-Specimen Density Requirements.

The documents of our country that have consistent correspondence with the international documents referenced normatively in this standard are as follows.

GB/T 1933-2009 Wood density determination method (ISO 3131. 1975, MOD) the following editorial changes have been made to this standard.

-Modify the standard name to "Density Requirements for Connection Test Specimens for Structural Wood Metal Fasteners";

-Removed the introduction and references of ISO 8970.:2010;

-The normative reference document is changed to the national standard GB/T 1933 (see Chapter 2) for easy use.

Please note that some elements of this document may involve patents. The issuer of this document is not responsible for identifying these patents.

This standard was proposed and managed by the National Timber Standardization Technical Committee Structural Timber Subcommittee (SAC/TC41/SC4).

This standard was drafted. Suzhou Feitweier Wooden Structure House Co., Ltd., Forestry Industry Planning and Design Institute of National Forestry and Grassland Bureau, Tianxian Guanglian Wood Industry Co., Ltd., Northeast Forestry University, Institute of Wood Industry, Chinese Academy of Forestry, Huzhou Hengding Product Testing Center, School of Foreign Languages, Jishou University, Tianjin University.

1 Scope

This standard specifies the method for selecting specimens based on the density of wood. It is used for the connection strength and stiffness of metal fasteners for structural wooden members.

Can test. This standard shall be used in conjunction with the test method standard.

This standard applies only to structural wood samples.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document.

GB/T 1933 Wood density measurement method (ISO 3131, MOD)

3 Symbols and units

k correction factor

sigma standard deviation, kg/m3 rho Density of wood used in test results, kg/m3 rhom average density of wood used in test results, kg/m rhom, sel The average density of the wood of all selected specimens applied in the test results, kg/m

4 Wood sampling methods and requirements

5 Test report

The test report should include.

a) The species of wood or all species of a group of different woods, the moisture content at the time of specimen selection, the density distribution of the selected specimens, all Select the average density of the test pieces;

b) the average density and standard deviation of the wood used in the test results;

c) the standards used (including the year of publication or publication);

d) whether the test specimen meets the requirements of this standard;

e) abnormal phenomena and problems that need to be explained during the test;

f) Test date.