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Elucidation of deformation and failure mechanisms of tensile-bolted connection in timber structures and development of evaluation methods

Research Project

Project/Area Number 21K20458
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0304:Architecture, building engineering, and related fields
Research InstitutionChiba University

Principal Investigator

Totsuka Marina  千葉大学, 大学院工学研究院, 助教 (60893774)

Project Period (FY) 2021-08-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords木質構造 / 引きボルト / 割裂 / 繊維方向圧縮 / めり込み / 接合部 / 縦圧縮 / 木質ラーメン
Outline of Research at the Start

木質構造を中大規模建物に用いると,今まで想定されていなかった変形や破壊が生じることがある。実際に,申請者が予備試験として行った大型の引きボルト接合部の引張実験では,これまで想定されていなかった繊維方向の圧縮変形及び割裂破壊モードが見られた。本研究は,中大規模木質構造に有用な引きボルト式接合部の変形・破壊のメカニズムを解明し,評価法を提案することを目的とする。
本研究により,大型の引きボルト接合部を用いた木質構造を中大規模建物に採用しやすくなり,中大規模木質構造の増加につながる。

Outline of Final Research Achievements

This experimental and analytical study focused on tensile-bolted connections, which are one of the most commonly used joints in mid- to high-rise timber structures. It was found that tensile-bolted connections can fail by splitting, in addition to the well-known types of bolts yielding, compression yielding of the wood under the washer, shear failure of the wood, and bending failure of the wood. Split failure is a brittle failure, which means that the load drops to zero after the maximum bearing capacity. Furthermore, the cause of sprit failure was found to be the stress concentration around the bolts near the end grain.
A method using fracture mechanics was proposed to evaluate the spit failure, and it was confirmed that the experimental values could be generally evaluated. It was also shown that sprit fracture can be prevented by driving a self-tapping screw across the cross section of the wood.

Academic Significance and Societal Importance of the Research Achievements

本研究成果により,中高層木質構造に引きボルト式接合部を用いた場合の破壊モードを明確にできた。また,今まで破壊メカニズムがわかっていなかった引きボルト式接合部の割裂についてそのメカニズムを明らかにしたことで破壊荷重を予測できるようにした。また,引きボルト式接合部は柱脚だけでなく,柱梁接合部や梁の継手としてもつかわれる。提案する柱脚の評価法は鉛直荷重をゼロとすれば柱梁や梁継手に応用できる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (7 results)

All 2024 2023 2022

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] EVALUATION OF STIFFNESS PARALLEL TO GRAIN OF WOOD BASED ON STRONGEST LINK MODEL2022

    • Author(s)
      TOTSUKA Marina、HAYAKAWA Jun、AOKI Kenji、INAYAMA Masahiro
    • Journal Title

      Journal of Structural and Construction Engineering (Transactions of AIJ)

      Volume: 87 Issue: 798 Pages: 770-779

    • DOI

      10.3130/aijs.87.770

    • ISSN
      1340-4202, 1881-8153
    • Year and Date
      2022-08-01
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Experimental study of compressive properties parallel to grain of glulam2022

    • Author(s)
      Totsuka Marina、Jockwer Robert、Kawahara Hiro、Aoki Kenji、Inayama Masahiro
    • Journal Title

      Journal of Wood Science

      Volume: 68 Issue: 1

    • DOI

      10.1186/s10086-022-02040-7

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 引きボルト式接合部の割裂破壊を誘発する応力集中の解析的検討2024

    • Author(s)
      鈴木みなみ,戸塚真里奈,平島岳夫
    • Organizer
      日本木材学会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 木質構造における引きボルト式接合部の耐力・剛性および破壊モード その1 割裂耐に関する試み2023

    • Author(s)
      戸塚真里奈,鈴木みなみ,中山征人,平島岳夫
    • Organizer
      日本建築学会大会学術講演梗概集
    • Related Report
      2023 Annual Research Report
  • [Presentation] 木質構造における引きボルト式接合部の耐力・剛性および破壊モード その2 水平加力試験2023

    • Author(s)
      鈴木みなみ,戸塚真里奈,中山征人,平島岳夫
    • Organizer
      日本建築学会大会学術講演梗概集
    • Related Report
      2023 Annual Research Report
  • [Presentation] Study on Load-carrying Capacity and Failure Modes of Tensile-bolted Joints in Timber Structures2023

    • Author(s)
      Minami Suzuki, Yukito Nakayama, Marina Totsuka,Takeo Hirashima, and Yoshihiro Yamazaki
    • Organizer
      SWST
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 引きボルト接合部の耐力・剛性及び破壊モード2023

    • Author(s)
      鈴木みなみ,中山征人,戸塚真里奈,平島岳夫,山崎義弘
    • Organizer
      日本建築学会関東支部
    • Related Report
      2022 Research-status Report

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Published: 2021-10-22   Modified: 2025-01-30  

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