会议名称：2023世界木材日研讨会暨第五届国际林联（IUFRO）林产品文化研究组讨论会
会议时间：2023年3月21日

报告嘉宾：Kaori FUJITA
嘉宾简介：日本东京大学工学院 教授

摘要：
Log architecture has been one prototype of traditional timber structure in many regions rich in forest resources. The authors have been operating on-site investigation on historical log architecture in Japan and East European countries for the past seven years. Through multiple onsite investigation it has been identified that there are similarities as well as many difference amongst these historical log architectures. The most prominent difference is in the shape of the log sections. The sectional shapes of the historical log architecture are round, square, or rectangular. But in Japan log architecture using triangular section (pentagonal or hexagonal section to be precise) logs are found. The logs used in these “triangular log architecture (azekura in Japanese)” are stacked on top of each other with the ridge line facing outside and the flat surface to the inside constituting a distinct exterior wall. Many of these “triangular log architecture” are of cultural value. There are 43 “triangular log architecture” in Japan constructed before the mid-19th century, and out of these 37 are designated as cultural properties by the national or local government. The oldest date back to the 8th century, and many of these buildings are used as treasure house to keep precious objects within temples or shrines.
The distinct triangular section result in highly complex joints at the corners. But the information of the shape of joint is not well known. The result of literature survey of the joint used in log architecture by the authors is presented, together with their structural system. Finally, the similarity and difference of historical log architecture are discussed based on multiple examples from Japan, Ukraine and Poland together with the possible preservation methodologies.