Evaluation of structural member performance by dynamic strain measurement of real buildings

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02293
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: The University of Tokyo
• Principal Investigator: Iyama Jun 東京大学, 大学院工学系研究科(工学部), 准教授 (30282495)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 構造ヘルスモニタリング / ひずみ計測 / 鉄骨構造 / 損傷検知 / 常時微動 / 構造実験技術 / 振動台実験

Outline of Final Research Achievements

This research aims to establish practical technology that can instantly determine the safety of steel-framed buildings and the need for repairs after an earthquake based on dynamic strain and acceleration measurements. an dynamic strain measurement system was developed that was inexpensive but had sufficient performance, followed by establishing theories for detecting fracture, bending deformation of steel components based on micro strain vibration. In addition, by applying them to various large-scale shaking table tests and actual structures, it was demonstrated that they are fully practical and capable of detecting extremely minute damage, such as a decrease in the composite effect of composite beams and a decrease in column base stiffness. Furthermore, experimental techniques were developed to be used for damage detection technologies for various structural and non-structural components in the future, and a full-scale structural testbed was fabricated demonstrated as an example.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

構造物の動ひずみ計測は実験室レベルではすでに一般的な計測技術であるが、極めて高コストであった。これを実建物にも適用できるまで、低コスト化、簡便化しつつ、必要十分な性能を確保することができた。また、日常的な微小振動によっても、構造物の性能や損傷が評価可能となったため、大地震襲来中の計測が必ずしも必要ではなくなり、計測維持のためのコストも低減できた。この結果、本システムの適用性・実用性を大きく高めることができ、地震後の残存性能評価や修復必要部位を特定する技術を広く一般に普及させる基礎を確立できた。これらの技術普及により、レジリエントな建物や都市の構築に貢献できることが大きく期待される。