Ambient Vibrations in Structural Health Monitoring

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Recent Development and Application of Structural
Control and Health monitoring
Aiqun Li School of Civil Engineering Southeast
University June 2008
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CONTENTS

• Introduction
• Viscoelastic Damper
• Viscous Fluid Damper
• Tuned Liquid Damper / Tuned Mass
• Damper / Active Mass Damper
• Challenges and Future Directions

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Huge Weight
Real-time Control
Low Frequency
Economical
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Viscous Fluid Damper
Loop of Damping Force and Displacement
Different kinds of Fluid Dampers
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Application in Civil Engineering
Applied in Vibration Reducing of Buildings,
High-rise Buildings, Super High-rise
Buildings,Towers,Long-span Structures and
Bridges, etc.
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Contents

• Introduction
• Structural health monitoring system
• Baseline finite element modeling
• Structural damage alarming
• Data Analysis of GPS Monitoring System
• Data Analysis of Wind Monitoring System
• Data Analysis of Stress Monitoring System

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Introduction
Objective of structural health monitoring
Determination of damage existence
Determination of damages geometric location
Quantification of damage severity
Prediction of remaining life of the structure
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Structural health monitoring and condition
assessment system for Runyang Yangtse River
Bridge

150T?????????( 2005.7.20)
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Structural damage alarming
Strategy and methodology
Multi-scale decomposition of structural system
Multi-scale decomposition of structural response
Wavelet packet energy spectrum of structural
response
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Structural damage alarming method and system
based on the energy variations of structural
ambient vibration responses decomposed using
wavelet packet analysis
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Thanks for your attention!