2022 Fiscal Year Final Research Report
Mechanism of bridge damage during floods exceeding the design high water level and effect of reducing fluid force by fairings
| Project/Area Number |
19K04959
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 25030:Disaster prevention engineering-related
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| Research Institution | National Institute of Technology (KOSEN), Kure College |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
有尾 一郎 広島大学, 先進理工系科学研究科(工), 助教 (50249827)
黒川 岳司 呉工業高等専門学校, 環境都市工学分野, 教授 (50325148)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 洪水 / 流体力 / 水槽実験 / 数値流体解析 / 3Dレーザースキャナ |
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| Outline of Final Research Achievements |
Regarding the damage of bridges damaged by heavy rain disasters, water channel experiments and computational fluid dynamics were carried out to investigate the hydrodynamic forces acting on the bridge girders when the flood water exceeds the high water level as a coupled system of structure and fluid. Experiments were conducted to measure the hydrodynamic force acting on the bridge girder by changing the water level of the water channel in five steps from the bottom to the top of the bridge. In addition to a model of an open-floor plate girder bridge, changes in hydrodynamic forces with or without floor slabs and with or without railings were experimentally determined.
Using a 3D laser scanner, damaged bridges were used to perform 3D measurement of the bridge and its surrounding terrain, and a 3D model of the bridge and a model for computational fluid dynamics analysis were constructed from point cloud models of bridge piers, girders, and river revetments.
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| Free Research Field |
橋梁工学
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| Academic Significance and Societal Importance of the Research Achievements |
近年の大雨による災害において，計画洪水位を越える洪水流が橋桁に直接作用することにより，橋が損傷を受ける被害が多くなってきている。本研究では，水槽実験と数値流体解析によって橋桁に作用する流体力に関する基礎的なデータを取得した。また，3Dレーザースキャナで橋梁および護岸等の形状を計測した結果を使って，実際の橋梁周りの洪水流の数値シミュレーションを行うための数値解析モデルの作り方を検討した。
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