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Takanashi Ryuya

Research Faculty of Agriculture　Fundamental AgriScience Research　Forest ScienceAssistant Professor

建築構造物や土木構造物への木材の利用拡大を目指して、木材・木質材料の製造加工技術や性能評価について研究を行っております。集成材やCLTといった木質材料を主な対象として、これらを構造材料として使用する際の利用技術開発に取り組んでいます。

Researcher basic information

■ Degree
  • Ph.D. (Agriculture), Hokkaido University, Mar. 2019
■ URL
researchmap URLホームページURL■ Various IDs
Researcher number
  • 80733112
ORCID IDJ-Global ID■ Research Keywords and Fields
Research Keyword
  • Wood decay
  • Wooden material
  • Wood
  • Japanese larch
  • Glulam
  • Duration of load
  • Creep rupture
  • Cross laminated timber
  • CLT
Research Field
  • Life Science, Wood science
■ Educational Organization

Career

■ Career
Career
  • Feb. 2024 - Present
    Hokkaido University, Laboratory of Timber Engineering, Research Group of Forest Science Research Faculty of Agriculture, Assistant Professor, Japan
  • Apr. 2022 - Jan. 2024
    Forest Products Institute, Hokkaido Research Organization, Industrial Technology Group, Department of Wood Processing, Researcher, Japan
  • Apr. 2015 - Mar. 2022
    Forest Products Institute, Hokkaido Research Organization, Industrial Technology Group, Department of Wood Processing, Researcher, Japan
  • Apr. 2014 - Mar. 2015
    Forest Products Institute, Hokkaido Research Organization, Product Development Group, Department of Wood Processing, Researcher, Japan
Educational Background
  • Apr. 2016 - Mar. 2019, Hokkaido University, Graduate School of Agriculture, Division of Environmental Resources
  • Apr. 2012 - Mar. 2014, Hokkaido University, Graduate School of Agriculture, Division of Environmental Resources
  • Apr. 2008 - Mar. 2012, Hokkaido University, School of Agriculture, Department of forest Science
Committee Memberships
  • Jun. 2024 - Present
    公益社団法人土木学会, 木材工学委員会論文集編集小委員会 委員, Society
  • 2023 - Present
    一般社団法人日本木材学会, 技術士小委員会 委員, Society
  • 2023 - Present
    一般社団法人日本建築学会 材料施工委員会 既存木造建築物調査診断小委員会, 木材の劣化診断手法調査WG委員, Society
  • Apr. 2025 - Mar. 2027
    一般社団法人日本木材学会, 編集委員会 委員, Society
  • Nov. 2024 - Feb. 2025
    一般社団法人 木を活かす建築推進協議会, 木材強度試験法検討委員会 委員, Society
  • 2021 - 2025
    一般社団法人日本CLT協会, CLTリユース委員会 委員, Society
  • 2018 - 2019
    北海道森林建築セミナー実行委員会, WG委員, Others

Research activity information

■ Awards
  • Jan. 2024, The Japan Wood Research Society, The Japan Wood Research Society Progress Award
    北海道産材を活用した木質建築材料の長期的性能に関する技術開発
    Ryuya Takanashi
  • Jan. 2023, The Japan Wood Research Society, 第16回日本木材学会論文賞
    Evaluation of Out-of-plane Shear Strength of CLT made from Japanese Larch
    Yasuhiro Kawaai;Ryuya Takanashi;Kei Sawata;Yoshihisa Sasaki;Takanobu Sasaki
  • Oct. 2021, 地方独立行政法人北海道立総合研究機構, 令和3年度地方独立行政法人北海道立総合研究機構職員表彰 理事長表彰
    道産CLTの製造技術と利用技術の開発と実用化
    大橋義徳;宮﨑淳子;石原亘;高梨隆也;戸田正彦;冨髙亮介;石川佳生;古俣寛隆;松本和茂
  • Sep. 2018, 一般社団法人日本建築学会 構造委員会 木質構造運営委員会, 2018年度日本建築学会大会（東北）学術講演会 木質構造部門若手優秀発表賞
    22176 クリープ関数によるカラマツCLTのクリープ限度の推定
    高梨 隆也
■ Papers
  • CONSIDERATION OF THE BLOCK-SHEAR STRENGTH CRITERIA OF ORTHOGONALLY GLUED JAPANESE CEDAR TIMBER
    Ryuya TAKANASHI; Yoshinori OHASHI; Takuro MORI; Atsushi MIYATAKE; Kohta MIYAMOTO; Shiro NAKAJIMA; Tsubasa TANIGUCHI
    Journal of Structural and Construction Engineering (Transactions of AIJ), 91, 846, 947, 955, Architectural Institute of Japan, 01 Aug. 2026, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal
  • JOINT PERFORMANCE OF BEAM USING LONGITUDINAL DRIFT PINNED JOINT
    Masatake NAGATA; Kei SAWATA; Takanobu SASAKI; Ryuya TAKANASHI
    Japanese Journal of JSCE, 82, 28, Japan Society of Civil Engineers, 2026, [Peer-reviewed]
    Japanese, Scientific journal
  • Effect of Drying Temperature on Material Strength of Plantation-grown Species in Hokkaido II Effect of Drying Temperature on Compressive Strength Parallel to the Grain and Shear Strength
    Wataru Ishihara; Hideaki Tsuchihashi; Ryuya Takanashi; Yoshinori Ohashi
    WOOD INDUSTRY, 81, 1, 8, 13, Jan. 2026, [Peer-reviewed]
    Japanese, Scientific journal
  • Investigation of post-fabrication treatment of CLT using creosote oil and copper naphthenate
    宮内輝久; 伊佐治信一; 宮崎淳子; 高梨隆也; 大橋義徳; 佐々木貴信
    木材保存, 51, 3, 2025, [Peer-reviewed]
    Japanese, Scientific journal
  • MEASUREMENT OF YOUNG’S MODULUS AND SHEAR MODULUS OF PLYWOOD BY FLEXURAL VIBRATION TEST AND INFLUENCE OF SPECIMEN SHAPE
    Tomoyuki OGAWA; Takanobu SASAKI; Ryuya TAKANASHI; Kei SAWATA
    Japanese Journal of JSCE, 81, 4, Japan Society of Civil Engineers, 2025, [Peer-reviewed]
    Japanese, Scientific journal
  • Effect of Drying Conditions on Properties of Karamatsu IV. Relationship between Drying Temperature and Bending Performance of Lminae
    Ryuya Takanashi; Junko Miyazaki; Wataru Ishihara; Hideaki Tsuchihashi; Yoshinori Ohashi
    MOKUZAI KOGYO (Wood Industry), 80, 1, 17, 22, Jan. 2025, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal
  • INVESTIGATION OF THE MANUFACTURING METHOD OF CROSS-LAMINATED TIMBER (CLT) USING VACUUM PRESS
    Saya HATANO; Takanobu SASAKI; Kei SAWATA; Junko MIYAZAKI; Kamii NAKAMURA; Ryuya TAKANASHI; Hidefumi YAMAUCHI
    Japanese Journal of JSCE, 80, 28, Japan Society of Civil Engineers, Mar. 2024, [Peer-reviewed]
    Japanese, Scientific journal
  • Effect of Drying Temperature on Material Strength of Plantation-grown Species in Hokkaido I Effects of Drying Temperature on Bending Strength
    Wataru Ishihara; Hideaki Tsuchihashi; Ryuya Takanashi; Yoshinori Ohashi
    MOKUZAI KOGYO (Wood Industry), 79, 2, 56, 61, Feb. 2024, [Peer-reviewed]
    Japanese, Scientific journal
  • Gap-filling properties of adhesives used for cross-laminated timber
    Junko Miyazaki; Kohta Miyamoto; Shin-ichiro Tohmura; Yoshinori Ohashi; Kazushige Matsumoto; Naoyuki Furuta; Ryuya Takanashi
    European Journal of Wood and Wood Products, 82, 123, 134, Springer Science and Business Media LLC, 25 Sep. 2023, [Peer-reviewed]
    English, Scientific journal
  • Out-of-plane shear strength of cross-laminated timber made of Japanese Larch (Larix kaempferi) with various layups and spans
    Yasuhiro Kawaai; Ryuya Takanashi; Wataru Ishihara; Yoshinori Ohashi; Kei Sawata; Takanobu Sasaki
    Journal of Wood Science, 69, Springer Science and Business Media LLC, 19 Sep. 2023, [Peer-reviewed]
    English, Scientific journal, Cross-laminated timber (CLT) is a promising construction material. When CLT is used for horizontal applications, shear stress occurs in the out-of-plane direction and can fracture the transverse layers owing to the rolling shear. The out-of-plane shear strength of the CLT can be evaluated by an out-of-plane loading test and is affected by the CLT layups and/or span conditions. In this study, we conducted out-of-plane loading tests on 3-layer 4-ply, 5-layer 7-ply, 7-layer 7-ply, and 9-layer 9-ply CLT made of Japanese larch (Larix kaempferi) under various spans and investigated the effect of layups and spans on the out-of-shear strength. The fracture modes of the specimens were classified into three types: shear fracture, shear fracture accompanied by bending fracture, and bending fracture. The out-of-plane shear strength of the specimens except for the 9-layer 9-ply ones decreased as the span increased, and then converged to a constant value (1.0–1.5 kN/mm2). In addition, the shear strength decreased exponentially as the number of laminae in the transverse layers increased and then converged to a constant value (1.0–1.5 kN/mm2). The out-of-plane shear strength of the 9-layer 9-ply specimens decreased as the shear span increased; however, the converged value with a longer span could not be calculated because the tests were conducted under only three-span conditions. The shear strength of 3-layer 4-ply specimens was lower than that of the other layups. The results of the Monte Carlo simulation of the shear strength of the laminae in the transverse layers showed that a model, which assumed that the minimum shear strength of the laminae in the transverse layers determined the shear strength of a specimen, tended to correspond with the decreasing tendency of shear strength with longer spans. The results showed that the weakest link model for the out-of-plane shear fracture of the CLT would relate to a specimen with long span.
  • Effect of Drying Conditions on Properties of Karamatsu III. Effects of High-temperature Setting Treatment Conditions on Surface Checks and Strength of Karamatsu Boxed-heart Square Timber
    Wataru Ishihara; Hideaki Tsuchihashi; Ryuya Takanashi; Yoshinori Ohashi; Takahisa Yoshida; Hiroshi Matsumoto; Hirofumi Nagao; Noboru Fujimoto
    MOKUZAI KOGYO (Wood Industry), 78, 8, 298, 304, Aug. 2023, [Peer-reviewed]
    Japanese, Scientific journal
  • Relationship between the Ratio of Width to Thickness and Rolling Shear Strength of Japanese Larch Lamina
    Yasuhiro Kawaai; Wataru Ishihara; Ryuya Takanashi; Yoshinori Ohashi; Kei Sawata; Takanobu Sasaki
    Mokuzai Gakkaishi, 69, 3, 134, 139, Japan Wood Society, 25 Jul. 2023, [Peer-reviewed]
    Japanese, Scientific journal
  • Effect of Drying Conditions on Properties of Karamatsu II. Effects of Drying Conditions on Surface Checks and Bending strength of Karamatsu Boxed-heart Square Timber
    Wataru Ishihara; Hideaki Tsuchihashi; Ryuya Takanashi; Yasuhiro Kawaai; Yoshinori Ohashi; Takahisa Yoshida; Hiroshi Matsumoto; Hirofumi Nagao
    MOKUZAI KOGYO (Wood Industry), 78, 3, 98, 103, Mar. 2023, [Peer-reviewed]
    Japanese, Scientific journal
  • Evaluation of Out-of-plane Shear Strength of CLT made from Japanese Larch
    Yasuhiro Kawaai; Ryuya Takanashi; Kei Sawata; Yoshihisa Sasaki; Takanobu Sasaki
    Mokuzai Gakkaishi, 68, 4, 179, 187, Japan Wood Society, 25 Oct. 2022, [Peer-reviewed]
    Japanese, Scientific journal
  • Shear Strength of CLT with Japanese Larch or Sakhalin Fir Exposed to Low Humidity Environments
    Wataru Ishihara; Ryuya Takanashi; Yasuhiro Kawaai; Yoshinori Ohashi; Takanobu Sasaki; Kei Sawata
    Mokuzai Gakkaishi, 68, 4, 154, 164, Japan Wood Society, 25 Oct. 2022, [Peer-reviewed]
    Japanese, Scientific journal
  • Effect of Drying Conditions on Properties of Karamatsu I. Relationship between Drying Temperature and Bending Strength
    Wataru Ishihara; Hideaki Tsuchihashi; Ryuya Takanashi; Yasuhiro Kawaai; Yoshinori Ohashi; Takuya Fujiwara
    MOKUZAI KOGYO (Wood Industry), 77, 9, 345, 349, Sep. 2022, [Peer-reviewed]
    Japanese, Scientific journal
  • Properties of Laminae of Mature Wood of Japanese Larch and Stress Grade Simulation of Glulam and CLT
    Ryuya Takanashi; Miho Yamada; Kazushige Matsumoto; Seiji Watanabe; Yoshinori Ohashi; Wataru Ishihara; Takeyoshi Uematsu
    Mokuzai Gakkaishi, 68, 2, 88, 96, Japan Wood Society, 25 Apr. 2022, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal
  • Out-of-plane Shear Strength of CLT with Japanese Larch or Sakhalin Fir II.
    Wataru Ishihara; Junko Miyazaki; Ryuya Takanashi; Yoshinori Ohashi; Hideaki Tsuchihashi; Atsushi Hyono
    Mokuzai Gakkaishi, 68, 2, 77, 87, Japan Wood Society, 25 Apr. 2022, [Peer-reviewed]
    Japanese, Scientific journal
  • Rolling Shear Strength of Laminae for CLT with Four Japanese Softwood Species Obtained by the Compression Method.
    Wataru Ishihara; Yasuhiro Kawaai; Ryuya Takanashi; Junko Miyazaki; Yoshinori Ohashi
    Mokuzai Gakkaishi, 68, 1, 36, 42, Japan Wood Society, 25 Jan. 2022, [Peer-reviewed]
    Japanese, Scientific journal
  • Long-term bending properties of cross-laminated timber made from Japanese larch under constant environment
    Ryuya Takanashi; Yoshinori Ohashi; Wataru Ishihara; Kazushige Matsumoto
    Journal of Wood Science, 67, 1, Springer Science and Business Media LLC, 25 Nov. 2021, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, AbstractCross-laminated timber (CLT) has been used extensively in timber construction. CLT panels are typically used in roofs and floors that carry a continuous load, and it is important to examine the long-term loading capacity of CLT. However, studies that focus on the long-term loading capacity of CLT are limited. To this end, we conducted long-term out-of-plane bending tests on seven-layer CLT made from Japanese larch (Larix kaempferi) under constant environmental conditions, investigated creep performance and duration of load, and experimentally analyzed creep rupture behavior. The mean estimated relative creep after 50 years was 1.49. The sample showed a satisfactory resistance to creep as a building material. The duration of load of most of the specimens in this study was shorter than the conventional value of small clear wood specimens. Specimens had a lower duration of load capacity than solid lumber. According to the results of survival analysis, a loading level of 70% or more caused the initial failure of specimens. Creep rupture of most of the specimens occurred at less deflection than displacement at failure in the short-term loading test. Additional studies focusing on the effects of finger joints, transverse layers, and width of a specimen on creep rupture behavior are suggested.
  • Properties under Long-term Load of Structural Lumber Sawn from Large-diameter Logs
    Tsuchimoto Takahiro; Kato Hideo; Aratake Shiro; Matsumoto Akihiro; Takanashi Ryuya; Ohashi Yoshinori; Ishihara Wataru
    MOKUZAI KOGYO (Wood Industry), 76, 11, 493, 498, Nov. 2021
    Japanese, Scientific journal
  • Bonding Strength between Cross Layers of CLT Evaluated by Torsion and Compression Block Shear Tests
    石原亘; 高梨隆也; 大橋義徳; 宮崎淳子; 中島昌一; 宮武敦; 新藤健太
    木材学会誌, 67, 2, 100, 108, Japan Wood Society, 25 Apr. 2021, [Peer-reviewed]
    Japanese, Scientific journal
  • Out-of-plane Shear Strength of CLT with Japanese Larch or Sakharin Fir I. Influence of loading methods and span conditions on shear strength
    Wataru Ishihara; Ryuya Takanashi; Yoshinori Ohashi; Kazushige Matsumoto; Masahiko Toda; Takeyoshi Uematsu
    Mokuzai Gakkaishi, 66, 4, 214, 224, Japan Wood Society, 25 Oct. 2020, [Peer-reviewed]
    Japanese, Scientific journal
  • Degradation of shear performance of screwed joints caused by wood decay
    Rintaro Ueda; Kei Sawata; Ryuya Takanashi; Yoshihisa Sasaki; Takanobu Sasaki
    Journal of Wood Science, 66, Springer Science and Business Media LLC, 29 May 2020, [Peer-reviewed]
    Scientific journal, Shear tests were conducted on screwed joints with decayed main members, and the degradation of shear performance of screwed joints by wood decay was investigated. The differences between decayed and control specimens in yield load (Py), and maximum load (Pmax) were both significant at the 1% level, while the difference in the initial stiffness (Ks) was not significant at the 5% level. The extent of decay was evaluated through Pilodyn penetration depth and the decay depth. Pilodyn penetration depth had no significant relationships with Ks, Py, or Pmax of screwed joints. It is inferred that no significant relationship was found between Pilodyn penetration depth and the strength properties because the range of the measured Pilodyn penetration depth was narrow (16–23.5 mm). The decay depth had a significant inverse correlation with Ks of the decayed specimens. There was no significant relationship between the decay depth and Py, or Pmax. Multiple regression analysis was conducted on Ks, Py, and Pmax using the decay depth and sound wood density (WDh) as 2 explanatory variables. The multiple regression of Ks, Py, and Pmax on the decay depth and WDh were significant at the 1%, 5%, and 1% level, respectively. Ks, Py, and Pmax are inferred to be determined by both the decay depth and WDh. The strength properties of screwed joints with one screw obtained in this study were compared with those of screwed joints with seven screws obtained in a previous study. The difference between Ks, Py, and Pmax of the screwed joints with one screw and those of the screwed joints with seven screws was not significant at the 5% level. It is inferred that shear performance of screw joints with multiple screws are sufficiently estimated from those of screw joints with one screw by simply multiplying the strength properties, even if the main members were decayed.
  • Examination of Manufacturing Conditions of Cross Laminated Timber Made with Karamatsu (Larix kaempferi) or Todomatsu (Abies sachalinensis) fo Visible Use under Low Humidity
    Wataru Ishihara; Junko Miyazaki; Yoshinori Ohashi; Kamii Nakamura; Ryuya Takanashi
    MOKUZAI KOGYO (Wood Industry), 75, 1, 10, 15, Jan. 2020, [Peer-reviewed]
    Japanese, Scientific journal
  • Effects of wood decay on the strength properties and deformation process of the screwed joints
    Rintaro Ueda; Kei Sawata; Ryuya Takanashi; Takanobu Sasaki
    Paper reports on Use of Wood for Civil Engineering, 18, 62, 69, Dec. 2019
    Japanese, Scientific journal
  • Shear Strength of Multi-screw Joints Connected to Decayed Lumber
    Ryuya Takanashi; Masahiko Toda; Teruhisa Miyauchi; Mitsunori Mori; Takuro Mori
    MOKUZAI GAKKAISHI, 64, 3, 122, 129, 25 May 2018, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal
  • Withdrawal strength of nailed joints with decay degradation of wood and nail corrosion
    Ryuya Takanashi; Kei Sawata; Yoshihisa Sasaki; Akio Koizumi
    Journal of Wood Science, 63, 2, 192, 198, Apr. 2017, [Peer-reviewed], [Lead author]
    English, Scientific journal
  • Optimum Cross Sections of Green Square-sawn Japanese Larch Timber with Pith Allowing for Reshaping Warped Cross Sections after Kiln Drying
    Ryuya Takanashi; Shinya Shirakawa; Atsushi Nakajima; Yoshinori Ohashi; Takuro Hirai
    MOKUZAI GAKKAISHI, 62, 5, 190, 197, 2016, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal
  • Fractography of shear failure surface of softwood decayed by brown-rot fungus
    Ryuya Takanashi; Wataru Ishihara; Kei Sawata; Yuzou Sano; Tomonori Azuma; Mitsunori Mori; Akio Koizumi; Yoshihisa Sasaki; Takuro Hirai
    Journal of Wood Science, 60, 3, 186, 193, Jun. 2014, [Peer-reviewed], [Lead author]
    English, Scientific journal
■ Other Activities and Achievements
■ Books and other publications
■ Syllabus
  • 林産学実習, 2024年, 学士課程, 農学部
  • 木材理学Ⅱ, 2024年, 学士課程, 農学部
  • 木質材料学, 2024年, 学士課程, 農学部
  • 構造力学演習Ⅱ, 2024年, 学士課程, 農学部
  • 木材工学実験, 2024年, 学士課程, 農学部
  • 木材理学実験, 2024年, 学士課程, 農学部
  • 構造力学演習Ⅰ, 2024年, 学士課程, 農学部
■ Affiliated academic society
  • ARCHITECTURAL INSTITUTE OF JAPAN
  • WOOD TECHNOLOGICAL ASSOCIATION OF JAPAN
  • THE JAPAN WOOD RESEARCH SOCIETY
  • 土木学会
■ Research Themes
  • Development of bridge deck panels using Large-scale wood-based materials (CLT, LVL, MPP)
    Grants-in-Aid for Scientific Research
    01 Apr. 2026 - 31 Mar. 2030
    佐々木 貴信; 高梨 隆也; 下妻 達也; 宮内 輝久
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 26K01029
  • Title in Japanese
    2024年度 研究開発助成事業 イノベーション創出研究支援事業 産学連携創出補助金
    Aug. 2024 - Mar. 2025
    Takanobu Sasaki; Ryuya Takanashi; Naoyuki Furuta; Yoshinori Ohashi; Yuki Furuido; Yuichiro Yamagami
    Northern Advancement Center for Science ＆ Technology, 北海道大学, 北海道立総合研究機構林産試験場, 株式会社山上木工, Coinvestigator
  • 予測モデルを活用した木質構造材料の長期強度性能評価法の開発
    科学研究費助成事業
    01 Apr. 2021 - 31 Mar. 2024
    高梨 隆也
    厚さ30mmのカラマツラミナを用いて無垢材、水性高分子-イソシアネート系接着剤を用いたフィンガージョイント材、レゾルシノール樹脂接着剤を用いたフィンガージョイント材、水性高分子-イソシアネート系接着剤を用いた3プライ集成材、水性高分子-イソシアネート系接着剤を用いた3層3プライCLTを製作した。3等分点4点荷重試験による短期荷重試験を行い、曲げ強度の分布を得た。また、ヤング係数と曲げ強度の関係を収集し、長期荷重試験体の真の曲げ強度を推定するために必要となるデータを得た。曲げ強度値の平均値を各仕様の標準強度として、この値を基準として短期荷重試験に用いた試験体とマッチングされた試験体で3等分点4点荷重試験による長期荷重試験を開始した。荷重レベル90%の試験は全仕様で終了しデータ収集を完了した。引き続き荷重レベル80%の試験を開始した。
    また、過去に実施した実大7層7プライカラマツCLTの長期曲げ荷重試験のデータを解析した。生存時間分析の適用性を検討し、生存確率の実測値にワイブル分布を仮定した曲線をあてはめた結果、荷重レベルに対する破壊挙動は、荷重レベル70%以上では初期に破壊確率が高くなる”初期不良モデル”、荷重レベル60%では時間経過とともに破壊確率が上昇する”製品寿命モデル”とみなすことができることを明らかにした。また、短期荷重試験に比較して長期荷重試験での破壊時のたわみが小さいことを明らかにした。これらの成果をまとめて論文発表を行った。
    日本学術振興会, 若手研究, 地方独立行政法人北海道立総合研究機構, 21K14893
  • Proposal on Evaluation Method of Residual Performance and Retrofitting Method for Timber Structure
    Grants-in-Aid for Scientific Research
    01 Apr. 2018 - 31 Mar. 2021
    MORI TAKURO
    We have created a database of residual strength performance as a material for different species when wood is subjected to bio-deterioration such as decay and termite damage, and residual strength performance of joints such as nails and screws. We also created a database of the relationship between various wood deterioration diagnostic equipment and residual strength performance. As a result, a primary database was built. In addition, the residual strength performance of the joints in various deterioration diagnostic equipment was estimated, and a secondary database was constructed based on them. We also conducted experiments on the residual strength and performance of resisting shear walls that have deteriorated due to decay, and expanded the primary database. In addition, seismic performance evaluation of wooden houses using the data was carried out, and the effects of eccentricity were clarified as the effects of deterioration.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hiroshima University, 18H01589