Evaluation of joints and grid walls using displacement recovery of compression wood and evaluation of aging

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06604
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Building structures/Materials
• Research Institution: Sugiyama Jogakuen University
• Principal Investigator: Shimizu Hidemaru 椙山女学園大学, 生活科学部, 講師 (70378917)
• Co-Investigator(Kenkyū-buntansha): 若島 嘉朗 富山県農林水産総合技術センター, 富山県農林水産総合技術センター木材研究所, 副主幹研究員 (10446635) ; 石山 央樹 大阪市立大学, 大学院工学研究科, 准教授 (90634436) ; 長谷川 益夫 富山県農林水産総合技術センター, 富山県農林水産総合技術センター木材研究所, 主任専門員 (90446633)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 圧縮木材 / 面格子 / 耐力壁 / 初期剛性 / 初期スリップ変形角

Outline of Final Research Achievements

Wood grid walls are widely used as a seismic-load resisting element for upgrading traditional Japanese wood structures. However, because the elements are expected to be joined loosely due to unavoidable drying shrinkage, the current design provisions attribute small initial stiffness to grid walls. An experimental study was conducted to examine how the seismic performance of grid walls may be improved by the use of compression wood. Result of the tests, the grid wall using compressed wood has made it possible to solve the problem of initial slip deformation. As for the displacement recovery of compressed wood, it was confirmed that the lower the temperature and the higher the compression ratio, the larger the displacement recovery. As a result of the endurance test, the stress residual rate showed a tendency of being higher in the longitudinal compression wood than in the compression wood.

Free Research Field

木質構造

Academic Significance and Societal Importance of the Research Achievements

本研究成果により、面格子壁が有する初期スリップ変形角という問題点の解決が可能となった。これは、中地震においても面格子壁が耐力壁として機能し、建物の損傷を防ぐことを意味する。圧縮木材により、この機能を発揮するため、接合金物などを多用しない社寺仏閣などの伝統的建築の耐震補強への活用が期待される。