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Initial Test Summary of Modal Properties for the New Jersey International Bridge Study

This document summarizes the initial test results from the modal properties study conducted on the New Jersey International Bridge from June 10-13, 2011. Multiple test setups were employed, utilizing a range of sensors to capture vertical, longitudinal, and transversal data across different spans and directions. The analysis involved power spectral density calculations and fast Fourier transforms to assess the bridge's structural behavior. The findings highlight the value of dynamic testing in understanding bridge performance and inform future research directions in structural analysis.

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Initial Test Summary of Modal Properties for the New Jersey International Bridge Study

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  1. New Jersey International Bridge Study Modal Properties Test June 10-13th, 2011 Initial Test Summary Lourdes Taveras, Steven Petroff, Mike Dean Marv Halling, Paul Barr

  2. Summary of Test Setups • Setup 1 • Span 2 • Northbound and Southbound • Sensors: 16 • Vertical: 12 • Longitudinal: 2 • Transversal: 2 • Setup 2 • Span 2 • Northbound and Southbound • Sensors: 20 • Vertical: 12 • Longitudinal: 4 • Transversal: 4

  3. Summary of Test Setups • Setup 3 • Span 1 and 2 • Southbound • Sensors: 20 • Vertical: 12 • Longitudinal: 4 • Transversal: 4 • Setup 4 • Span 1, 2, 3 and 4 • Northbound • Sensors: 20 • Vertical: 16 • Longitudinal: 2 • Transversal: 2

  4. Summary of Test Setups • Setup 5 • Span 1 • Northbound and Southbound • Sensors: 15 • Vertical: 9 • Longitudinal: 3 • Transversal: 3

  5. Explanation of Analysis • Power Spectral Density (PSD) • Fast Fourier Transform • 100 Hz - 4096 FFT • 50 Hz - 2048 FFT • 150 + Averages • 50 % Overlap • Hamming Window

  6. Instrumentation – Sensor Selection

  7. Instrumentation – Sensor Selection

  8. Instrument Layout – Below Deck, No MOT, Minimal Impact

  9. Instrument Layout – Shoulder Closure, All Spans

  10. Frequency Response for Setup 1

  11. Frequency Response for Setup 1

  12. Summary

  13. Summary • The findings from dynamic testing have value, but how much? • Global Information regarding structural behavior (if it can be understood) • Can the information from dynamic testing be acquired some other way? Are these “other ways” more cost effective? • What are the recommendations for the future? • I would argue that some information obtained by sensors/dynamics can not be obtained any other way. • The potential is incredible!!! This is why it is an active research area.

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