2023 Fiscal Year Final Research Report
fire resistance design of timber elemens based on self-fire stopping mechamism
Project/Area Number |
21H01490
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 23020:Architectural environment and building equipment-related
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Research Institution | Kyoto University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
仁井 大策 京都大学, 工学研究科, 准教授 (50414967)
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Project Period (FY) |
2021-04-01 – 2024-03-31
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Keywords | 木造耐火 / 燃え止まり / 炭化層 / 赤熱 / 脱落 / 数値シミュレーション |
Outline of Final Research Achievements |
This work corresponds with the mechanism of charring of glue laminated larch wood material during fire heating and stopping of glowing combustion during subsequent cooling phase. The research findings are summarized as follows: 1) As the amount of cooling air is increased during cooling period, self-burning of the surface layer is increased. 2) As to the charred depth, correlation with maximum temperature and charring front was investigated and summarized. 3) As to the geometry of crack in charred layer, basic characteristics were summarized including crack width, depth/width ratio and crack interval. 4) Reaction rate equations were derived for glowing combustion of char. 5) As to the possible maximum char layer thickness, ratio of char layer dropping, width and depth of dropping were examined and correlated with charred depth. 6) A numerical simulation model was developed including the above sub-models. Numerical simulation was performed for a GLT wall made of larch.
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Free Research Field |
建築火災安全工学
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Academic Significance and Societal Importance of the Research Achievements |
建築物への木材利用拡大が推進されているが、火災安全上の懸念として耐火性がある。火災時には柱、梁、床、壁等の構造部材が激しく加熱されて表層から内部へと炭化が進行し、火災終了後も自己燃焼が継続すると崩壊の懸念がある。崩壊を防ぐためには、盛期火災の加熱に耐えた上で、その後の自己燃焼を自ら停止する「燃え止まり設計」が必要となる。本研究の成果は、カラマツ集成材の実験と解析を通じて燃え止まりメカニズムに基づいた予測を可能にするものであり、大規模木造建築物の耐火設計を推進するための基盤的知見となる。
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