2022 Fiscal Year Final Research Report

Elucidation of Flexible Structural Mechanisms in Traditional Wooden Architecture in East Asia

Research Project

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Project/Area Number	19KK0113
Research Category	Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
Allocation Type	Multi-year Fund
Review Section	Medium-sized Section 23:Architecture, building engineering, and related fields
Research Institution	Kyoto University
Principal Investigator	Nakagawa Takafumi 京都大学, 生存圏研究所, 准教授 (60414968)
Co-Investigator(Kenkyū-buntansha)	北守顕久大阪産業大学, 工学部, 准教授 (10551400) 小松幸平京都大学, 生存圏研究所, 研究員 (20283674) 五十田博京都大学, 生存圏研究所, 教授 (40242664) 中島昌一国立研究開発法人建築研究所, 構造研究グループ, 主任研究員 (90734210)
Project Period (FY)	2019-10-07 – 2023-03-31
Keywords	伝統建築 / 斗組 / 柔構造
Outline of Final Research Achievements	The tie-beam on the columns, common in traditional East Asian wooden architecture, is composed of a number of elbows, and is an important structural element for transferring roof loads to the lower floors. Although previous studies have reported that it has a seismic damping effect, its academic elucidation is not sufficient. This study also aims to quantitatively and qualitatively elucidate the mechanism by which a model of a flexible structure unique to traditional construction methods, in which the roof - toe frames - columns and cross members - foundation stones, etc. are loosely connected, resists horizontal loads by utilizing vertical loads. The results of static force tests and shaking table tests have clarified the relationship between deformation and tilt resilience due to the different head-through specifications. It was also found that theoretical equations and numerical analysis could generally follow the experimental results.
Free Research Field	木質構造、木質材料
Academic Significance and Societal Importance of the Research Achievements	東アジアの古代建築を対象とした構造力学的研究に関しては、近年東アジアで徐々に研究事例が増えてきている。その動機は大工技術等の木づかいの文化を理解し、自国の歴史的建築物を保護することにある。日本でも、五重塔など伝統構法に見られる柔構造の性質を再評価し、現代の構造へ取り入れる試みが為されている。このように、伝統建築における技術を再評価することは木づかいの文化の継承において意義深い。日本の伝統建築のルーツとも言える中国や台湾の伝統構法を現地の研究者と連携して本研究を進められたことは構造的観点だけでなく、東アジアにおける伝統建築の構法学的観点からも学術的意義は深い。