1. Feature 2 Feature 1 土木基礎結構損壞偵測技術：含非線性環境影響之考慮 Feature 2 題目： 題 Feature 1 許丁友 先生 Associate Research Fellow, National Center for Research on Earthquake Engineering 講者： Feature 2 時地： 民國101/05/10 (三)3:00 PM.土木館5F Feature 1 1. Introduction 3. Treating Nonlinear Environmental Effects Motivation of SHM Due to Environment Due to Damage • Situation 1 • Features are sensitive to damage but insensitive to environmental factors • Environmental variability • Conditional variability • Physical size • Material variability • Vibration-based Damage Detection • Cost-effective • On-line automatic • Condition-based Ho-Feng Bridge (2008) • Situation 2 Structural Life Trends of features due to damage and environment are analogous Point Excitation Ground Excitation Hungary (2010) Minneapolis Bridge (2007) • Performance Monitoring • Visual inspection or NDT • Costly • Time consuming • Time-based Alamosa Canyon Bridge (Sohn et al. 2001) Z24 Bridge(Peeters & De Roeck 2001) • Damage Detection • Situation 3 • Trends of features due to damage and environment are distinct Metrodome(2010) Hubei (2008) 4. Conclusions • The Frequency Response Function Change (FRFC) method • Non-FEM-based Level-III damage detection • Numerical and experimental studies • The integration between FRFC method and WSS • On-line automatic Level-III damage detection • Collocated computing resources of WSS • The energy consumed by WSUs could be greatly reduced • A method treating nonlinear environmental effects to achieve Level-III damage detection is proposed and verified by numerical studies • Without measuring the environmental factors • Non-decreasing or non-increasing, e.g. damage index 2. Damage Detection Methods Motive & Literature Review 感謝 許丁友 先生 精彩的演講