Estimation of tsunami damage of bridges due to Nankai-Tounankai earthquake

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04589
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Tobishima Research Institute of Technology
• Principal Investigator: kosa kenji 飛島建設株式会社技術研究所, －, 特別研究員 (00315160)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 耐震 / 津波 / 橋梁 / 津波波力 / 被害調査 / 耐津波設計 / 耐震設計

Outline of Final Research Achievements

1)Evaluation for the horizontal or vertical force acting on the bridge girder：The tsunami experiment was conducted by using the parameters as wave height, girder position from the static water level. It was confirmed that the evaluation formula for horizontal force Fx (vertical force Fz)can be proposed as the factors of wave height aH, girder position and side area of girder (bottom area of girder). The proposed equation was compared with other same type of bore wave experimental tests.
2)Evaluation of bridge damage due to Nankai Trough Earthquake：The coRal method, which is a probabilistic tsunami hazard assessment method is applied to the bridge girder where the tsunami risk due to the Nankai through earthquake is assumed. The results showed, ｄuring operation period, the Shiohama bridge was small possibility to wash away due to earthquake.

Free Research Field

構造工学および地震工学関連

Academic Significance and Societal Importance of the Research Achievements

我が国では100～200年周期で南海・東南海地震が発生しており大きな被害が予測される．そこで発生した東日本大震災，熊本地震，セラウェシの被害分析により，近い将来発生する大地震の被害状況も想定できることから本研究は極めて意義深い研究と考えられる.