LY/T 3140-2019Timber structures -- determination bending yield moment of dowel-type fasteners (English PDF)

Foreword

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

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

This standard was drafted. Institute of Wood Industry, Chinese Academy of Forestry, Xiamen Minghongtang Crafts Co., Ltd., Shanghai Wood Industry Industry Research Institute, Zhejiang Shiyou Wood Industry Co., Ltd., Zhejiang Woodcarving Redwood Furniture Product Quality Inspection Center, Chinese Academy of Forestry Forestry New Technology Institute, Hebei Agricultural University, Nanjing Forestry University, Anhui Agricultural University, Inner Mongolia Agricultural University, Anhui Forestry Survey Planning Institute, First Inspection (Beijing) Testing Technology Co., Ltd., Heilongjiang Wood Science Research Institute.

1 Scope

This standard specifies the test method for the yield bending moment of pin fasteners.

This standard applies to the testing and evaluation of the yield bending moment of pin-type fasteners for wooden structures when subjected to static bending loads.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this document.

For undated references, the latest version (including all amendments) applies to this document.

LY/T 2059-2012 steel nails for wood structures

3 Terms and definitions

The following terms and definitions apply to this document.

Dowel type fasteners Nails, code nails, bolts, screws and round pins, etc.

3.2.1

Fastener section dimension the diameter of the rod (smooth or contoured) of a round pin-type fastener other than the coating;

3.2.2

Fastener section dimension the length of the side of the square pin type fastener except the coating;

3.2.3

Fastener section dimension Oval or rectangular pin-type fasteners have the smallest cross-section except coating.

Yield moment

Bending moment of pin-type fasteners under yield load.

Note. In this standard, the yield load deviates from the intersection of the load-deflection curve and the initial tangent modulus line by 5% of the cross-sectional dimensions of pin fasteners.

The load representation.

4 Symbols

d- cross-section dimensions of pin fasteners, mm;

F- static bending load on pin fasteners, N;

Fy-yield load determined from the load deflection curve, N;

l-Length of pin fasteners, mm;

5 Test equipment

5.1 The accuracy of measuring load of the testing machine should reach 1%, and the curvature diameter of the support and indenter end of the testing device is 10 mm.

5.2 The cross-section dimension test gauge should be accurate to 0.02mm.

6 Test method

7 Test results

8 Test report

The test report should include the following.

a) the name of the testing laboratory;

b) the date of the test report;

c) standard number;

d) description of the fasteners;

e) description of the test equipment;

f) loading speed;

g) the location of the free length of the fastener under test;

h) the number of replicates;

i) load-deflection curve;

j) Yield moment.