Study on local damage investigation of building structure using ambient vibration records

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420560
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Building structures/Materials
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Iiyama Kahori 東京工業大学, 環境・社会理工学院, 研究員 (90711870)
• Research Collaborator: MORIKAWA Hitoshi 東京工業大学, 環境・社会理工学院, 教授 (60273463) ; KOBAYASHI Riichiro 東京工業大学, 環境・社会理工学院, 大学院生
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 構造ヘルスモニタリング / 固有振動数 / 固有モード / モード減衰定数 / 常時微動 / 損傷同定

Outline of Final Research Achievements

The object of this study is to develop a practical local-damage-detection method of building structures, which is based on ambient vibration measurement. From the analysis of vibrational characteristics based on high-density array measurements for severely deteriorated buildings through the Frequency domain decomposition (FDD) technique, and the numerical study using the multi-dimensional flame model, the followings were revealed; 1) If the local stiffness of building structures extremely changes, the location of it can be identified using identified modal properties, that is, natural frequency and eigenmode. 2) If the local stiffness of building structures slightly changes, to detect its local damage is quite a task and then such an auto-power spectral density can be practical indicator. Furthermore, a new modal identification method which uses only two measurement points was analytically developed.

Free Research Field

地震工学