GB/T 26899-2022 English PDF

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GB/T 26899-2022: Structural glued laminated timber
Status: Valid

GB/T 26899: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 26899-2022	839	Add to Cart	6 days	Structural glued laminated timber	Valid
GB/T 26899-2011	2039	Add to Cart	8 days	Structural glued laminated timber	Obsolete

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Basic data

Standard ID: GB/T 26899-2022 (GB/T26899-2022)
Description (Translated English): Structural glued laminated timber
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: B70
Classification of International Standard: 79.060.99
Word Count Estimation: 46,447
Date of Issue: 2022-10-14
Date of Implementation: 2023-05-01
Older Standard (superseded by this standard): GB/T 26899-2011
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 26899-2022: Structural glued laminated timber

---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.
Structural glued laminated timber ICS 79.060.99 CCSB70 National Standards of People's Republic of China Replacing GB/T 26899-2011 Structural Glulam Published on 2022-10-12 2023-05-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface III 1 Scope 1 2 Normative references 1 3 Terms, Definitions and Symbols 1 4 requirements 7 4.1 Quality of laminates 7 4.2 Laminate assembly 11 4.3 Adhesives 19 4.4 Dimensional tolerance and appearance quality 20 4.5 Physical and chemical properties 21 4.6 Anti-corrosion and insect-proof performance 24 5 Inspection methods 24 5.1 Dimensional deviation and appearance quality 24 5.2 Glue performance test 26 5.3 Moisture content 29 5.4 Bending resistance 30 5.5 Tensile strength 34 5.6 Formaldehyde emission 34 5.7 Drug Loading and Penetration 37 6 Physical and chemical performance inspection rules 37 6.1 Sampling plan for physical and chemical properties 37 6.2 Determination of inspection results 38 7 Product identification38 Appendix A (Informative) Laminate Finger Joint Requirements 40

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. This document replaces GB/T 26899-2011 "Structural Glulam". Compared with GB/T 26899-2011, except for structural adjustment and editing In addition to the sexual changes, the main technical changes are as follows. a) Changed the definition of "visual grade" (see 3.1.27, 3.1.27 of the.2011 edition); b) the term "characteristic strength" was deleted (see 3.1.37 of the.2011 edition); c) Changed the thickness and deviation requirements of laminates (see 4.1.2, 4.2.2 of the.2011 edition); d) The requirements for discoloration, vortex lines and cracks have been changed (see Table 1, Table 1 of the.2011 edition); e) Added the very minor and minor requirement descriptions for other defects (see Table 1); f) Changed the difference in moisture content of the same structural laminate (see 4.2.1, 4.3.1 of the.2011 edition); g) Changed the tree population classification (see Table 3, Table 4 of the.2011 edition); h) Added the description of requirements for cracking, discoloration and reverse texture (see Table 5); i) Changed the content of the longitudinal spacing of adjacent laminates (see 4.2.3.2, 4.3.3.2 of the.2011 edition); j) Changed the symbol of strength grade of glulam for structure (see Table 9, Table 13, Table 14, Table 21, Table 22 and Table 23, Table 9, Table 13, Table 14, Table 21, Table 22 and Table 23); k) Changed the selection and use principles of adhesives (see 4.3.1, 4.1.1 of the.2011 edition); l) Added the content of polyurethane adhesive (see 4.3.2); m) Added the content of glulam for secondary gluing structure (see 4.3.3); n) Changed the requirements for warping and twisting (see 4.4.3, 4.4.3 of the.2011 edition); o) Added the description of the non-obvious requirements in the surface quality grades and requirements of glulam for structural use (see Table 20); p) Changed the description of the peel test under the conditions of use environment 1, 2 and 3 (see 4.5.2.1, 4.5.2.1 of the.2011 edition); q) Changed the requirements for moisture content (see 4.5.3, 4.5.3 of the.2011 edition); r) Changed the content and grade symbols of formaldehyde emission (see 4.5.4, Table 25, 4.5.4 and Table 25 of the.2011 edition); s) Added the requirements and inspection methods for the anti-corrosion and insect-proof performance of the glulam for structures (see 4.6, 5.7, 6.1.2, 6.2, Table 28, Table 29); t) The inspection method of "dimensional deviation and appearance quality" of laminated wood for structure is added (see 5.1); u) Changed the content of peel test specimen production (see 5.2.1.1, 5.1.1.1 of the.2011 edition); v) Changed the drying range of the test piece (see 5.2.1.2, 5.1.1.2 of the.2011 edition); w) Changed the shear strength test method (see 5.2.2.2, 5.1.2.2 of the.2011 edition); x) Modified the test piece fabrication method of bending test method A (see 5.4.1.1, 5.3.1.1 of the.2011 edition); y) Modified the reference standard for the calibration of sodium thiosulfate solution (0.1mol/L) (see 5.6.2.2.2, 5.5.2.2.2 of the.2011 edition); z) Added "Sampling Plan for Dimensional Deviation and Appearance Quality Inspection of Structural Glulam" (see 6.1.1). Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by the State Forestry and Grassland Administration. This document is under the jurisdiction of the National Standardization Technical Committee for Wood-based Panels (SAC/TC198). This document was drafted by. Beijing Forestry University, Yantai Bohai Woodworking Machinery Co., Ltd., China Academy of Building Research Co., Ltd., Heilong Jiangxi Institute of Wood Science, Beihua University, Harbin Institute of Technology (Weihai), Wood Industry Research Institute of China Academy of Forestry, Canada Shanghai Representative Office of Wood Industry Association, Nanjing University of Technology, China Southwest Architecture Design and Research Institute Co., Ltd., Henkel (China) Investment Co., Ltd., Shanghai Haiyiles Enterprise Consulting Co., Ltd., European Wood Industry Association of European Union Chamber of Commerce in China, Daxinganling Shenzhou Arctic Wood Industry Co., Ltd., Nanjing University of Technology Construction Engineering Technology Co., Ltd., Shandong Dingchi Wood Industry Group Co., Ltd., Millennium Boat New Material Technology Group Co., Ltd., Hubei Tianxin Wood Structural House Manufacturing Co., Ltd., Taier Chemical (Nanjing) Co., Ltd., Shanghai Mingang New Material Technology Co., Ltd., Dingli New Material Technology Co., Ltd. Co., Ltd., Chongqing Zhonglin Forestry Technology Co., Ltd., Qian'an Dashu Industry Co., Ltd., Guilin Xinmei Environmental Protection Technology Co., Ltd., Shan Dongshun Innovative Materials Technology Co., Ltd., Shouguang Luli Wood Industry Co., Ltd., Zhejiang Shenghua Yunfeng New Materials Co., Ltd., Shandong Tokyo Bomuji Materials Co., Ltd., Yantai Huanghai Woodworking Machinery Co., Ltd., Harbin Chengfeng Adhesive Co., Ltd., Sichuan Xinhong Ruisen Wood Industry Co., Ltd., Beixin International Wood Co., Ltd., Jiangsu Huidian New Materials Co., Ltd., Beijing Xinsen Zhiye Engineering Consulting Co., Ltd. The main drafters of this document. Liu Hongguang, Shen Shijie, Liu Xiangfei, Chen Shubing, Bi Kexin, Shi Junyou, Zhu Enchun, Li Jie, Zhou Haibin, Zhang Haiyan, Yue Kong, Ogaga, Zhai Zhiwen, Chen Xiaofeng, Zhang Shaoming, Liu Bailong, Liu Xingxing, Ke Haitao, Lu Tonghua, Li Long, Wu Haili, Zhong Fei, Zhou Mugang, Zhang Xiangyang, Quan Zhihua, Wang Qiansheng, Tu Huaigang, Guo Zhiwu, Gui Chengsheng, Feng Ye, Zhang Shuqing, Wang Duo, Zhang Keyan, Zhang Fangwen, Zhang Yudong, Zhao Bin, Liu Wen, Yang Xuebing, Zhu Yading, Gong Yingchun, Qi Chusheng, Nie Fei, Wang Xiaomin, Ma Yan, Cui Lidong. The previous versions of this document and its superseded documents are as follows. ---First published in.2011 as GB/T 26899-2011; ---This is the first revision. Structural Glulam

1 Scope

This document defines the terms, definitions and symbols for structural glulam, and specifies the requirements, inspection methods and inspection rules for structural glulam. and product identification, etc. This document applies to structural glulam.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. Preparation of GB/T 601 Standard Titration Solutions for Chemical Reagents GB/T 23229 Analysis method of waterborne wood preservatives GB/T 27651 Use classification and requirements of preservative wood GB/T 27654 Wood preservative GB/T 37315 Basic requirements for bonding properties of wood structure adhesives ISO.20152-2 Bonding properties of wood structural adhesives - Part 2.Additional requirements (Timberstructures-Bondper- 3 Terms, Definitions and Symbols 3.1 Terms and Definitions The following terms and definitions apply to this document. 3.1.1 For the purpose of load-bearing, laminate the laminates (which can be finger-jointed, miter-jointed or wide-split) by grades parallel to each other along the fiber direction and lamination in the thickness direction. Composite structural material. Note. Mainly used for load-bearing members of building structures. 3.1.2 laminate lamina The various layers of boards that make up the structural glulam. 3.1.3 Structural glulam made of laminates of the same quality grade. ......

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