2023 Fiscal Year Final Research Report
Elucidation of the seismic mechanism of the multi-dougong structures found in wooden temples built in the Song dynasty
| Project/Area Number |
21K04352
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 23010:Building structures and materials-related
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| Research Institution | Kyoto University |
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Principal Investigator |
KOMATSU Kohei 京都大学, 生存圏研究所, 特任教授 (20283674)
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| Co-Investigator(Kenkyū-buntansha) |
北守 顕久 大阪産業大学, 工学部, 准教授 (10551400)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 繊維直交方向 / めり込み / 斗 / 肘木 / 減衰定数 / 上載荷重 / 摩擦 / ダボ |
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| Outline of Final Research Achievements |
We focused on the "Jyouto" structure composed of multi-bearing blocks and bracket arms and the "Fuhekikyou" structure in which the walls were made of beams and bracket complexes, which can be seen in ancient wooden temple buildings existing in China. Static experiments and sinusoidal sweep experiments using layered model specimens were conducted for the "Jyouto" model specimens, and the high damping performance expected as the wood damper was confirmed. Regarding the "Fuhekikyou" structure, static cyclic loadings were conducted using model specimens in which the location, number of bracket complexes, and magnitude of dead load were varied, and the restoring force characteristics were estimated to be caused mainly by the Coulomb friction between the bearing block and beam with some addition of the shear resistance of the wooden dowels. It was presumed that the multi-layered bracket complex system discussed in this study played a role similar to a wood damper against seismic motion.
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| Free Research Field |
木質構造科学分野
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| Academic Significance and Societal Importance of the Research Achievements |
木材と鉄そして石を利用して驚異的な木造寺院建築物を造り上げていた古代において、建築を主導していた大工頭領などの技術者は、木材がその長軸方向に対して直交する方向に力を受けた場合にその細胞構造が柔軟に変形して大きな荷重に耐えられることを良く知っていた。屋根を大きく張り出すために生み出された斗と肘木を組み合わせた斗きょう構造はこの木材組織構造の柔軟な変形特性を巧みに活用して大きな屋根荷重を各所に分散配置させ、さらにその重さを再利用して地震による横揺れを減らすダンパー的な役割も演じていたのではないだろうか。本研究の成果は以上の推論のごく一部をモデル的に確認したものとして意義があると考えられる。
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