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New Jersey International Bridge Study

New Jersey International Bridge Study. Modal Properties Test June 10-13 th , 2011 Initial Test Summary. Lourdes Taveras , Steven Petroff, Mike Dean Marv Halling, Paul Barr. Summary of Test Setups. Setup 1 Span 2 Northbound and Southbound Sensors: 16 Vertical: 12

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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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