GB/T 40487-2021 in English
VALIDStructural bamboo glulam
- Issued on:2021-08-20
- Implemented on:2022-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | GB/T 40487-2021 |
| Document status: | VALID |
| Title in English: | Structural bamboo glulam |
| Title in Chinese: | 结构用竹集成材 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2021-08-20 |
| Implemented on: | 2022-03-01 |
| ICS Classification: | 79.060.01-Wood-based panels in general |
| Professional Classification: | GB-National Standard |
| Related Topics: | bamboo
Glulam for structures Structural Glulam Bamboo Glulam The structure of trapping hydrazine structural imaging Glulam secondary structure composition trap structure GBT40487 GB/T 40487-2021 Structural bamboo glulam Bamboo glulam for non-structural use integrated bamboo Structural materials for low temperature |
《GB/T 40487-2021结构用竹集成材》由TC263（全国竹藤标准化技术委员会）归口，主管部门为国家林业和草原局。
Introduction
Analysis of the technical framework of the standard
GB/T40487-2021 is my country's first national standard specifically for structural bamboo laminated materials, which has established a complete technical system from raw materials to finished products. The standard innovatively introduces the characteristic values of bamboo mechanical properties into the structural material evaluation system, where the bending elastic modulus takes the average value, and other properties use the 5% quantile value with a 75% confidence level.
Comparison of key performance indicators
| Test items | Layer requirements | Glue requirements | Test method |
|---|---|---|---|
| Moisture content | 8%-15% | 8%-15% | GB/T17657-2013 |
| Horizontal shear strength | Dry state ≥10MPa(vertical) | Glue layer ≥10MPa | LY/T2225-2013 |
| Flexural modulus | 9000-14000MPa | 8000-12000MPa | GB/T26899-2011 |
Key points of innovation in bonding technology
The standard specifically stipulates that structural bamboo laminated materials must use resorcinol resin (RF) or PRF adhesives. The technological breakthroughs are reflected in:
- Passed the dual environment applicability verification (humidity 65%/85%)
- The shear strength of the adhesive layer requires an average value ≥10MPa and a single point ≥6MPa
- The peeling rate is controlled by a dual-track test (immersion/boiling)
Strength Grade Implementation Guide
The standard divides products into 5 strength grades from 80E-65F to 120E-78F. Attention should be paid to the following during implementation:
- The elastic modulus of the plywood should be 1-2 grades higher than that of the integrated wood
- The strength of the finger-jointed plywood needs to be corrected by the derating factor
- The finger-joint positions of adjacent layers should be kept ≥500mm dislocation
Key Points of Quality Control
Based on the sampling plan in Article 6.2 of the standard, it is recommended that enterprises establish a three-level quality control:
| Control links | Key parameters | Detection frequency |
|---|---|---|
| Raw materials | Moisture content/density of bamboo strips | Per batch |
| Production process | Gluing pressure/temperature | Per hour |
| Finished product inspection | Formaldehyde emission | Per 500㎡ |
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