GB/T 38704-2020 in English
VALIDFrame system of timber supporting curtain wall
- Issued on:2020-03-31
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
$321.00
| Standard No: | GB/T 38704-2020 |
| Document status: | VALID |
| Title in English: | Frame system of timber supporting curtain wall |
| Title in Chinese: | 建筑木框架幕墙组件 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2020-03-31 |
| Implemented on: | 2021-02-01 |
| ICS Classification: | 91.060.10-Walls. Partitions. Facades |
| Chinese Classification: | P32-Building construction and decoration engineering |
| Professional Classification: | GB-National Standard |
| Related Keywords: | curtain wall introduction interpretation
use area wood moisture content meter wind pressure standard technical dimensions key requirements test methods glued wood strength frame system flexural strength ≥28mpa gb/t26899-2011 moisture content control |
| Related Topics: | curtain wall
wooden frame use GBT38704 GB/T 38704-2020 european curtain wall components European and domestic standards for building curtain walls |
《GB/T 38704-2020建筑木框架幕墙组件》由TC448（全国建筑幕墙门窗标准化技术委员会）归口，主管部门为住房和城乡建设部。
Introduction
Interpretation of the core content of the standard
| Technical dimensions | Key requirements | Test methods |
|---|---|---|
| Glued wood strength | Not less than TCr21/TCvp18 grade, flexural strength ≥28MPa | GB/T26899-2011 |
| Moisture content control | 6%-13%, 1%-3% lower than the equilibrium moisture content of the use area | Wood moisture content meter |
| Wind pressure bearing | Deflection ≤ 1/250 of span and ≤ 20mm | Appendix B Test Method |
Key Technical Requirements
1. Material Specifications
Glued wood must meet the following requirements: Fire resistance ≥ B1, Formaldehyde emission up to F☆☆☆, visible surface strip length > 250mm. Water-based paint must pass the 168h yellowing resistance test (ΔE≤3.0).
2. Connection structure
- Beam-column connection points ≥2, screw diameter ≥4.5mm
- Cross-layer connection hole diameter ≥15mm, spacing ≥3 times the hole diameter
- Panel fixing component spacing ≤250mm
Implementation points
Solutions to typical engineering problems
Case:In a project, the displacement of the connection part of the 180mm column exceeded the standard in the 3.5kPa wind pressure test. Upon review, it was found that:
1) The double-layer installation holes were not set according to the standard requirements
2) The thickness of the connector was insufficient, resulting in a decrease in stiffness
Corrective measures: Use stainless steel connectors with a thickness of ≥6mm and increase the number of M10 bolts to 3.
Analysis of Standard Evolution
Compared with traditional steel-aluminum curtain walls, this standard establishes for the first time:
• Dynamic control principle of moisture content of wood structures
• Gravity/wind pressure bidirectional bearing performance grading system
• Normative Appendix on strength characteristic values and elastic modulus of integrated wood (Appendix A)
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