Risk of long term power outage in urban areas due to wind-borne debris during super typhoon

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04589
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 25030:Disaster prevention engineering-related
• Research Institution: Kumamoto University
• Principal Investigator: Tomokiyo Eriko 熊本大学, 大学院先端科学研究部(工), 教授 (30346829)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 飛散物 / 張力変動 / 強風被害

Outline of Final Research Achievements

In the case of structural damage caused by strong winds, not only damage due to wind force but also damaged fragments and other flying debris can cause a chain of damage that can expand. In this study, the effect of entanglement of flying debris on electric wires was examined. When flying debris adheres to a structure, the area subjected to strong winds increases, and the force on the structure increases. Measurements of cable tension due to entanglement of attached objects showed that the weight of the attached objects had a strong influence on the increase in tension, and the instantaneous deformation of the attached objects affected the tension fluctuation. In addition to the average tension increase due to wind pressure, wind speed fluctuations and the behavior of the adhesions were found to affect the tension fluctuations.

Free Research Field

風工学

Academic Significance and Societal Importance of the Research Achievements

本研究では，強風下でのケーブル張力の変動に及ぼす付着物の影響を検証した。飛来物の付着による構造物への影響を定量的に把握することは被害拡大の要員分析の一助となる。もって，大規模停電を引き起こした強風被害要因の究明に資する情報が提供できる。近年の台風による広域での長期間停電原因の一つに，飛来物による設備の損傷が挙げられており，飛散物が付着した送配電設備の挙動が分れば，飛散物被害の低減対策を検討し，都市部での停電や断水，さらには通信遮断等の重要インフラの機能不全リスクの低減が期待できる。