Mechanical and analytical studies on mechanical properties of steel structure column base

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K15137
• 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: Kyoto University
• Principal Investigator: Takatsuka Kouhei 京都大学, 工学研究科, 助教 (90758351)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 鋼構造 / 柱脚 / 弾性剛性 / 有限要素法解析

Outline of Final Research Achievements

For the exposed column base widely used at mid-and-low-rise steel building, finite element method analyses and loading tests were conducted, and a calculation formula of the elastic stiffness was proposed considering: [1] the out-of-plane deformation of the compression side baseplate and the bearing deformation of the foundation concrete, [2] the out-of-plane deformation of the compression side baseplate and the elongation of the anchor bolts, [3] the number and the layout of the anchor bolts. Although the proposed formula is more complicated than the currently widely used formula by considering [1]~[3], the proposed formula can estimates the elastic stiffness with higher accuracy.

Free Research Field

鋼構造

Academic Significance and Societal Importance of the Research Achievements

本研究で提案した弾性剛性算定式は既往のものに比べ複雑ではあるが，算定式そのものは陽関数であり，露出柱脚の実用の範囲を考えて算定式を近似することで算定式の簡便化が可能と考えられる．また，本検討で用いたモデルは構造力学で広く用いられている単純なものの組み合わせであり，本検討で考慮した以外のアンカーボルトの本数や配置の場合にも剛性算定式への反映が容易となっている．さらに，一部が陰関数となってしまうが本検討での算定式は軸力が作用する場合にも対応している．すなわち，この算定式を用いることで，とくに1層の応答への影響が大きいとされている柱脚の弾性剛性をより高い精度で算定することが可能となった．