2021 Fiscal Year Final Research Report
Development of analytical methods at the interface between bridge engineering and sediment hydraulics
| Project/Area Number |
20K21025
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 22:Civil engineering and related fields
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
里深 好文 立命館大学, 理工学部, 教授 (20215875)
野阪 克義 立命館大学, 理工学部, 教授 (50373105)
四井 早紀 立命館大学, 理工学部, 助教 (60875897)
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| Project Period (FY) |
2020-07-30 – 2022-03-31
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| Keywords | 構造工学 / 土砂水理学 / 防災 / 橋梁設計 / 数値解析 |
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| Outline of Final Research Achievements |
Bridges have been washed away by floods and debris flows almost every year. In many cases, the space under the girders is blocked by sediment and driftwood, causing water to overflow from the river and increasing damage. The objective of this study is to develop a method for calculating flood forces acting on bridges.
A computer code based on a one-dimensional analysis of riverbed variation was developed. The code was validated using the data of the Nishise Bridge in Hitoyoshi City, which lost a bridge girder in the July 2020 heavy rain disaster. The numerical analysis resulted in that the drag force was found to be stronger than the estimated strength of the bearings based on the design standards at the time of construction.
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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 |
構造工学分野における水害対策はさほど注目されてこなかった．橋の自然災害対策として地震や風に関しては多くの研究がなされ一定の成果を挙げているのに対し，橋の水害対策に関する研究例はほとんどなく，この分野の発展は遅れていた．本研究の成果は，橋梁工学と土砂水理学との境界領域における解析手法を構築したことに意義がある．
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