1. 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

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 Sercel L4C 1.0Hz. Seismometer Type Moving Dual Coil, Humbuck Wound Frequency1.0±0.05 hz. Suspended Mass1000 g Coil Resistance5500 Height13 cm Diameter7.6 cm Weight2.15 kg Operating Temperature -29°C to 60°C Environmental Protection Dust, Moisture Resistance Transduction/m/sec277.8

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

12. Summary SouthBound ModeSpan 1Span 2Span 3Span 4 12.8082.856 Not Tested 2-3.125 33.8093.711 44.5274.541 59.3519.375 612.3812.3 714.8714.94 815.15315.6 NorthBound ModeSpan 1Span 2Span 3Span 4 1-2.954-2.93 23.735 -3.32 34.4195.273-4.81 46.0066.036.25- 510.2111.1611.7911.5 614.215.16-14.28 716.9716.9217.72- 818.9520.8--

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.