Study on the utilizing technology of rapid measurement and 3D Lissajous figure for reconstruction support of houses damaged by natural disasters

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K18846
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 23:Architecture, building engineering, and related fields
• Research Institution: Hiroshima University
• Principal Investigator: Ohkubo Takaaki 広島大学, 先進理工系科学研究科(工), 教授 (60185220)
• Project Period (FY): 2022-06-30 – 2024-03-31
• Keywords: ドローン / 無線加速度センサ / 常時微動 / 診断 / リサージュ / 固有周波数 / 被災住宅

Outline of Final Research Achievements

This technology development involved equipping a drone with a high-performance wireless acceleration sensor and landing it on a building in order to measure microtremors and develop a method for rationally diagnosing the structural safety of buildings. Basically, the objective was to quickly diagnose on-site the extent of damage to buildings damaged by earthquakes, etc. using three-dimensional litharge based on microtremor measurements. From measurement experiments on actual buildings and experiments on test specimens using a three-dimensional shaking table, we found that it is possible to measure actual buildings using this method, and that the progress of damage to buildings can be monitored by constantly detecting microtremors using a wireless acceleration sensor equipped with a drone. It was shown that it is able to be estimated from the change in the natural frequency and the Lissajous waveform.

Free Research Field

建築材料学

Academic Significance and Societal Importance of the Research Achievements

研究代表者は，熊本地震および西日本豪雨災害時の応急診断・地域復興段階において，各種センサを被災地に持ち込み，戸建て住宅の計測を行い，被災住宅の補修・補強法を定めるための現地調査を行った。その際，被災住宅の損傷診断に最も効果的であったのが「３軸無線加速度センサを用いた振動リサージュ」であった。しかし，この調査では，調査者の安全確保のために計測対象の住宅数が限定された。本技術開発は，これを解決するためにドローンと無線加速度センサを併用した現地計測と解析手法の確立に取り組んだ。本技術は災害時のみならず，常時微動計測によるRC構造物の健全性診断にも活用できるものであり社会貢献ができると考えている。