2023 Fiscal Year Final Research Report
Improving maintenance for steel structures with ultra-high durability mechanical fasteners
| Project/Area Number |
20H02235
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 22020:Structure engineering and earthquake engineering-related
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| Research Institution | Osaka Metropolitan University (2022-2023)
Osaka City University (2020-2021) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
林 厳 大阪公立大学, 大学院工学研究科, 助教 (10869530)
森山 仁志 徳島大学, 大学院社会産業理工学研究部(理工学域), 講師 (50825495)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 高力ボルト / 摩擦接合継手 / メカニカルファスナー |
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| Outline of Final Research Achievements |
This study aimed to develop a non-projecting, hourglass-shaped bolt set (hereafter referred to as "DSF") that improves the corrosion resistance of steel structures. Tensile, shear, and fastening performance tests were conducted using a prototype DSF, and its applicability to frictional joints was investigated. The results clarified that the DSF can achieve the target performance when 13 or more threads are engaged and the axial force is controlled using the rotation angle method. In addition, the DSF’s structure, which allows the bolt and nut to engage along its entire length, can provide shear strength equivalent to that of an M22-F10T when extended to a longer length
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| Free Research Field |
構造工学・地震工学
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| Academic Significance and Societal Importance of the Research Achievements |
従来の高力六角ボルトを用いた部材接合部では，ボルト頭部およびナットの角部を起点とした腐食進行が問題となる．I桁のような開断面部材の接合部に，本研究で提案したDSFを適用することで，部材形状に依存しない防食性能を 大幅改善した摩擦接合継手が実現できる．これにより，鋼橋の損傷そのものを減少させることができ，鋼構造物メンテンナンスに関わる人的・物的コストを大幅に削減することができる．
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