Study on Drift Pin Joints with Steel Plate Insertion using Spacer

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K20461
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0304:Architecture, building engineering, and related fields
• Research Institution: Okayama University
• Principal Investigator: FUKUMOTO KOJI 岡山大学, 環境生命自然科学学域, 特任准教授 (50964772)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: 木質構造 / ドリフトピン接合 / 履歴性状 / スペーサ / 支圧強度式 / 構造解析モデル

Outline of Final Research Achievements

In this study, the drift pins were passed through spacers to disperse the bearing stress on the surrounding wood, thereby reducing the penetration into the wood. In this study, static force tests were conducted and a structural analysis model was developed to ensure a good fit. The following results were obtained
(1) The spacer improved the history of drift pin and bolt joints with a base metal thickness of 105 mm and a diameter of 12 mm, but reduced the deformation performance. (2) The Sawata/Yasumura equation for calculating the bearing strength of drift pin joints, including cyclic history, was found to be applicable even when large-diameter spacers were used.

Free Research Field

木質構造設計学

Academic Significance and Societal Importance of the Research Achievements

ある径まではスペーサによる履歴性状の改善が得られた一方で，全体の径が大きくと木材側の支圧強度が低下し，エネルギー吸収性能の向上が期待できないという結果が得られた．
この性状を構造解析により再現しようとした際，既往のSawata/Yasumura式を適用することで良好な適合性を得られ，更に正負交番繰り返し荷重における履歴形状についても良く再現された．これは，本研究にて提案したスペーサ付きドリフトピン接合のみならず，鋼板挿入型ドリフトピン接合等の曲げ降伏型の接合形式全般に適用が可能と考えられ，再現性の高い構造解析モデルを提示することができ，当初は想定していなかった学術的成果となった．