Evaluation of Structural Safety Considering Robustness of Seismically Isolated Structures: Resilience-Oriented Structural Planning for Seismically Isolated Buildings

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K04799
• 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: Meiji University
• Principal Investigator: Kobayashi Masahito 明治大学, 理工学部, 専任教授 (50373022)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 建築構造・材料 / 免震 / 構造設計 / 安全余裕度 / ロバスト性 / 冗長性 / レジリエンス

Outline of Final Research Achievements

Seismically isolated buildings are required to cope with earthquake ground motions such as large-scale earthquakes along the Nankai Trough and inland earthquakes in the Osaka Uemachi Fault Zone　that greatly exceed conventional design levels. To cope with these situations、 it is essential to evaluate the safety margins of seismically isolated buildings、 but seismically isolated structures lack robustness and redundancy. In this study、 with the aim of developing a structural safety evaluation method that takes into account the robustness and redundancy of seismically isolated buildings、 we conducted a survey of design trends using the database and evaluated the margins of seismically isolated buildings in consideration of their robustness and redundancy with respect to earthquake ground motion levels. Based on the results of these analyses、 we proposed a design method that is oriented toward ensuring safety margins.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

国内外を問わず、想定外事象に対するシステムの性能として、レジリエンスの概念が様々な分野で重要視されるようになってきている。レジリエンシーの向上には冗長性やロバスト性を高めることが有効である。建築防災の観点で免震構造は大きな期待を背負っているが、地震動レベルの増大に対してはロバスト性・冗長性が低いという特性を有している。本研究で提案する免震構造の余裕度評価の方法と余裕度確保を指向した設計法は、免震構造による建築物および都市のレジリエンシーの確保に貢献するものと考えられる。