Study on the development of the wooden hybrid members in steel structural buildings

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14878
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Fukuoka University
• Principal Investigator: Yo Kuratomi 福岡大学, 工学部, 助教 (50709623)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: CLT / ラグスクリューボルト / 鉄骨造 / せん断パネル / ヨーロッパ型降伏理論式 / 混合構造 / 合成梁

Outline of Final Research Achievements

Cross-laminated timber (CLT) is a solid wood panel commonly used as a structural material to construct moderate-to-large-sized buildings because of its high strength and stiffness. Hence, we proposed replacing reinforced concrete slabs with CLT floor panels in moderate-to-large-sized buildings.
We used a lag-screw-bolt (LSB) as a shear connector and hexagon head bolts to connect the steel members and CLT panels. LSBs were embedded in CLT panels at a factory before arrival at the construction site. On the construction site, workers simply connected steel beams to CLT panels using a hexagon head bolt. Herein, push-out shear test, cyclic shear test and bending test were conducted to investigate the structural performance of the proposed connection method between steel members and CLT panels. Based on the test results, the study indicated that the wooden hybrid structural system is an effective method to engage using forest resources.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

本研究課題では，LSBをせん断抵抗させた際の挙動を実験的に調べ，LSB一本当たりの降伏せん断耐力評価法を提案した。CLTは面材として床や壁への使用が効果的である。床への適用に際して，鉄骨梁との合成梁効果を調べるために曲げ実験を実施し，純鉄骨梁に対して曲げ耐力および曲げ剛性を向上できることを示した。また，間柱型せん断パネルの架台をCLTに置換することを検討し，その接合部にLSBを使用する構法を提案した。いずれも良好な実験結果が得られており，今後，鋼構造オフィスビルなどの床や壁を木質化する際に有益な研究成果となるものと考えられる。