2023 Fiscal Year Final Research Report
Integration and reconstruction of wind environment planning theory to adapt to the progressive intensification of urban heat and strong wind hazards.
| Project/Area Number |
21H01486
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 23020:Architectural environment and building equipment-related
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
石田 泰之 東北大学, 工学研究科, 助教 (20789515)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 屋外風環境設計 / ビル風 / 暑熱適応 / 将来気候 / 強風災害 / city breathability / 移流 / 乱流拡散 |
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| Outline of Final Research Achievements |
The impacts of urban morphology on city breathability, an indicator of the air exchange capacity between the upper and inner urban areas, the occurrence of strong winds and the deterioration of the wind environment on the downwind side are quantified using CFD results. It was concluded that breathability should be improved by turbulent diffusion rather than advection, which causes strong wind and adverse effects on the downwind side. Based on the results of wind tunnel tests, the wind resistance safety of the low-rise buildings around a high-rise building was evaluated for wind pressure acting on the low-rise buildings during extremely high wind events in the present and future. Finally, the points to be considered in wind environment planning are summarized to simultaneously secure the city breathability and reduce adverse effects on the wind environment on the downwind side during normal conditions, and secure the safety of the surrounding buildings during extremely high wind events.
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| Free Research Field |
建築環境・設備
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| Academic Significance and Societal Importance of the Research Achievements |
ヒートアイランド問題が政策課題として取り上げられた2000年代初頭以来、過去20年にわたり都市の弱風対策がビル風等の強風対策と連携することなく進められてきた。しかし、気候変化による都市の暑熱化が進み、風通しの一層の改善が求められるとともに、台風の大型化に伴う強風対策が一層求められることは間違いないので、本研究により強風対策と弱風対策を統一的に進める理論的枠組みが構築された社会的意義は非常に大きい。さらに、高層建物により現行の荷重指針を上回る風荷重が周辺の低層建物に作用する可能性を示したことで、現在欠落している、稀なる強風時の周辺の低層建物の耐風安全性を評価する重要性を示した。
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