Investigation of tsunami loads acting on a group of building structures

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04713
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Akita Prefectural University
• Principal Investigator: OBATA AKIHIKO 秋田県立大学, システム科学技術学部, 助教 (30433147)
• Co-Investigator(Kenkyū-buntansha): 寺本 尚史 秋田工業高等専門学校, その他部局等, 准教授 (00315631) ; 佐藤 公亮 東北大学, 工学研究科, 助教 (50788510)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 津波荷重 / 連棟配置 / 津波圧力 / 水理実験 / 数値流体解析

Outline of Final Research Achievements

The tsunami caused by the earthquake occurred off the Pacific coast of Tohoku resulted in severe and extensive damage to structures in northeastern Japan. Consequently, the establishment of safer design methods has become a matter of social responsibility. The damage survey report of the Tohoku-Pacific Ocean Earthquake confirms that the tsunami load is reduced when there is an obstacle upstream. However, few studies have been conducted on these subjects to date.
In this study, hydraulic model tests and a CFD simulation are carried out on isolated and a group of rectangle or cylindrical structures to investigate the basic characteristics of tsunami forces acting on them. The characteristics of the tsunami forces acting on the isolated and grouped buildings were investigated based on the experimental and analytical results. Discussion is made of the effects of structures arrangement on the tsunami forces and pressures.

Free Research Field

建築構造学

Academic Significance and Societal Importance of the Research Achievements

本研究は，護岸を越流する津波が連棟配置された建築構造物群に作用する津波荷重を水理実験および数値流体解析より明らかにした。その結果，一棟のみの場合と比べて，津波に対して計測用模型が障害物模型の陰に隠れる配置パターンで波力が小さくなり，津波に対して計測用模型が障害物模型と並列に並ぶ配置パターンでは波力が大きくなることが確認できた。本研究の結果より，特に配置計画などは見直すことによって津波荷重を低減させることができると期待できる。