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Nicolás A. Londoño David T. Lau Department of Civil & Environmental Engineering

Variability Characteristics of Structural Health Monitoring Data and Development of Engineering Report Tool. Nicolás A. Londoño David T. Lau Department of Civil & Environmental Engineering Carleton University Ottawa, Canada. SAMCO Summer Academy Zell am See, Austria Sept 5-9, 2005.

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Nicolás A. Londoño David T. Lau Department of Civil & Environmental Engineering

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  1. Variability Characteristics of Structural Health Monitoring Data and Development of Engineering Report Tool Nicolás A. Londoño David T. Lau Department of Civil & Environmental Engineering Carleton University Ottawa, Canada SAMCO Summer Academy Zell am See, Austria Sept 5-9, 2005

  2. Overview • Introduction • Computer Tools • Research using Confederation Bridge field monitoring data • Design properties verification • Variability of monitoring data • Engineering Report Tool • Conclusions

  3. Confederation Bridge

  4. Monitoring System Data logger LAN Sensors On Site Computers Internet Carleton University Processing • Analysis (System Identification) • Frequency • Mode-shape • Damping ratios Condition Assessment Engineering Reporting and Interpretation

  5. Data characteristics Wind scenario Traffic scenario 40 seconds 600 seconds

  6. Wind scenarios Traffic scenarios

  7. Stochastic Subspace Identification State Space model Output-only monitoring data Singular Value Decomposition Data cross-correlations Stochastic State-Space Model Matrices Block Toeplitz Matrix Frequencies Mode Shapes Damping Ratios

  8. SPPLASH – Signal Processing PLatform for Analysis of Structural Health

  9. Identified 2.76 Hz Theoretical 2.59 Hz MAC 0.89

  10. Verification Study– Modal Frequencies –

  11. Verification Study– Modal Damping and MAC –

  12. Variability-Sources- • Numerical uncertainties • Deviation from model assumptions • Data non-stationarity • Non-whiteness of the inputs • Measurement noise • Computational uncertainties • Use of finite datasets • Analyst input • Physical Uncertainties • Environmental and loading fluctuations • Temperature effects • Bridge-vehicle coupling, etc.

  13. Baseline Variability

  14. Mode shape variability

  15. Baseline variability

  16. General variability

  17. Temperature Effect Modal Frequency (Hz) Temperature (Hz)

  18. Variability vs. sensitivity

  19. Engineering Report Tool • Motivation • Enhance feedback given to bridge owners and operators • Provide timely systematic information of engineering relevance for decision support • Requirements • Automated file sorting and processing • Easy to search database

  20. END

  21. Confederation Bridge Monitoring Data • Truck Traffic induced vibration • Wind storm (Nov. 7 2001) • Typical ambient vibration

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