GB/T 28993-2012 English PDF

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GB/T 28993-2012: Standard test methods for mechanical properties of structural lumber
Status: Valid

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Basic data

Standard ID: GB/T 28993-2012 (GB/T28993-2012)
Description (Translated English): Standard test methods for mechanical properties of structural lumber
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: P23
Classification of International Standard: 91.080.20
Word Count Estimation: 14,184
Quoted Standard: GB/T 1933; GB 50005
Regulation (derived from): National Standards Bulletin No. 41 of 2012
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the structural lumber bending strength and flexural modulus of elasticity, tensile strength parallel to grain, compressive strength parallel to grain, shear strength parallel to grain, stripes and tensile strength, compressive stre

GB/T 28993-2012: Standard test methods for mechanical properties of structural lumber

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Standard test methods for mechanical properties of structural lumber ICS 91.080.20 P23 National Standards of People's Republic of China Structural Timber mechanical test Issued on. 2012-12-31 2013-06-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. Please note that some of the content of this document may involve patents. Distribution of this document Institutions do not assume the responsibility to identify these patents. This standard was proposed by the State Forestry Administration. This standard by the National Standardization Technical Committee of timber structures Wood Technical Committee (SAC/TC41/SC4) centralized. This standard was drafted. Chinese Academy of Forestry Wood Industry Research Institute, Suzhou Royal overall residential Systems, Inc., expensive State-ming Fir Villa Manufacturing Co., Ltd. Diamond Wood China, Nanjing University of Science and Technology Co., Ltd. Suzhou Xiangshan appropriate configuration. The main drafters of this standard. Lv Jianxiong, Jiang Jinghui, Ren Haiqing, Luo Xiuqin, Zhou Haibin, Yin Armenia, Ni Jun, Wang Xin, Zhu Qimin, Lu Weidong. Structural Timber mechanical test

1 Scope

This standard specifies the structural sawn timber bending strength and flexural modulus of elasticity, tensile strength parallel to grain, compression strength parallel to grain, shear strength parallel to grain, Stripes tensile strength, compressive strength and stripes stripes compressive elastic modulus, torsional modulus of elasticity test method. This standard applies to sawn.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 1933 Wood Density Determination GB 50005 design of timber structures

3 Terms and Definitions

GB 50005 and defined by the following terms and definitions apply to this document. 3.1 Sawn lumber After sawing sectional, sectional and then dried, planed, cut end, classification to produce a certain size, quality level and usage characteristics of sawn products. 3.2 Timber width width The vertical distance between the narrow face sawmills.

4 test piece

After the specimen temperature (20 ± 2) ℃ and relative humidity Adjustment (65 ± 5)% of the conditions to constant weight, corresponding to a water content of 12%. Specimens should be full scale sectional sawmills selected, the length of the specimen required by the provisions of Chapter 6, the largest decrease in the intensity of the defect should be placed randomly test Test area. Before the test, the specimen should be recorded species, place of origin, the largest decrease in strength defects, drying method, moisture content adjustment method, weight and size. Specimen The accuracy of the weight and size of 1%. After the test, immediately near the site of the destruction intercept length 15mm whole cross-section of the moisture content of non-defective piece for determination of moisture content by drying method. Densitometry accordance with the provisions GB/T 1933's.

5 Test conditions

Mechanical test should be (20 ± 2) ℃ and relative humidity (65 ± 5)% of the environment is carried out at room temperature; special research purposes, or special Specific requirements, test conditions can be changed. Select the appropriate loading rate, the specimen should be about 1min damage, failure time greater than 10s, less than 10min. It shall be recorded during the test temperature, relative humidity, moisture content of sawn timber and sawn timber destroyed by time. ......

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