Research on enhancement of resilience by building monitoring system considering complex disasters.

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04334
• 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: Kyoto University
• Principal Investigator: Fujita Kohei 京都大学, 工学研究科, 准教授 (40648713)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 複合災害 / 連成振動 / 免震建物 / 地震時応答 / 長周期長時間地震動

Outline of Final Research Achievements

This study focuses on the seismic behavior of buildings in the event of earthquakes occurring in states affected by compound disasters such as tsunamis or heavy rainfall. Analytical investigations and experimental demonstrations were conducted to examine how the degree of inundation affects the behavior of buildings. The target buildings are base-isolated structures, and the study assumes prolonged exposure to long-period seismic motions while fluid remains in the isolation pits. The presence of still fluid was experimentally demonstrated to result in changes in wave height not only due to inertial forces from seismic input but also from movement of the base-isolation slab. Furthermore, through fluid-structure interaction vibration analysis, it was revealed that the seismic performance of base-isolated buildings in submerged states may deteriorate depending on factors such as isolation clearance and inundation depth, leading to increased acceleration of the upper structure.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

本研究の成果を活用することで，都市を構成する建物において様々な災害が同時に発生するというような通常の設計や建物の運用では想定されていない事態が起こったとしても，建物の安全性や機能維持の判断のための建物応答特性を事前に把握することができる。今後は，本研究の成果をさらに展開することで，複合的な災害に対しても様々な対策レシピを建物単体や地域レベルでの事業継続計画の策定などで対応することが可能となることが期待される。