| Project/Area Number |
22K20463
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0304:Architecture, building engineering, and related fields
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| Research Institution | Akita Prefectural University |
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Principal Investigator |
Firas HAWASLY 秋田県立大学, 木材高度加工研究所, 特任助教 (10962839)
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| Project Period (FY) |
2022-08-31 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | Wrapping LVL / Veneer reinforcement / Stem-branch junction / Timber frame joint / Wood-only joint / Bio-Inspired |
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| Outline of Research at the Start |
Trees use wood efficiently to create the seamless junction between the stem and the branch. On the other hand, timber frames utilize foreign materials and processes to achieve the structural column-beam joint that is usually stronger than the wood it connects, causing failure at the joint interface. This research approaches a frame joint with lessons learned from the growth model of tree branches in a wood-only application of relatively simple manufacturing technologies as a set spirally wound commercially available veneers around a seamless flow of fibres across the column-beam joint.
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| Outline of Annual Research Achievements |
Experimental investigations of wrapping angle combinations were conducted on flat-sided beams, the addition of wrapping material as flat angle-ply reinforcements on the sides significantly enhanced the performance of flatwise loaded LVL beams, approaching the performance of solid wood and edgewise loaded LVL beams. The reinforcing effect was manifested in an enhancement of the bending performance and stiffness of the core material.
This simplified application of incorporating a multi-directional assembly of fibers provides an enhancement in the structural integrity and economical utilization of wood veneers within engineered timber products.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
The development of wrapping in curved foramtions was technically challenging.
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| Strategy for Future Research Activity |
The application of continuous wrapping of single stripes in multiple layers on curved beams proved to be technically challenging. Consequently, a simplified application of form-specific sheets of veneer processed with laser cutting is being sought in order to deliver the desired wrapping effect in terms of grain direction and wrapping/clamping performance.
Moreover, an investigation is currently underway into the potential application of ring-shaped veneer hoops as a joining sleeve for the inclusion of applied LVL sections during glue-ups.
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