US Rt 23 Wayne Bridge Test - PowerPoint PPT Presentation

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  1. US Rt 23 Wayne Bridge Test US Rt 23 Wayne Bridge Test S. Paul Sumitro, Ph.D, PE Chris Roney www.smart-structures.com Leading the technology in Structural Health Monitoring

  2. Presentation outline Presentation outline • What Smart Structures is • Innovative sensory technology • Smart Scanner • Stick Scanner • Telecentric (deflection) • Telecentric (strain)

  3. Schematic description of SHMS

  4. Software for Bridge Health Monitoring

  5. SHMS System

  6. KRC Japan – Smart Structures USA Wayne Bridge Rt. 23 NJ June 10 -11, 2011

  7. KRC Japan – Smart Structures USA Wayne team

  8. Full-field Optical Monitoring Techniques - Smart Scanner: strain, stress - Stick Scanner: investigate internal concrete structures - Telecentric: - Strain - deflection 8

  9. OVERVIEW • As the first step to evaluate bridge’s condition, field load test is needed to assure bridge’s safety level • Troublesome in load test: • - Sensor installation; • - cabling 9

  10. Smart Scanner • Non-destructive and non-contact: • No scaffolding, no attachment , no cabling; • Speedy and appropriate information: • not only point-wise data, but also planar information; • No image-warp: constant focus and constant distance; • High resolution: • surface strain measurement, • user-friendly software based on digital image correlation method. 10

  11. Wide range Simple and low cost ★ Line Sensing Scanner ★ Resolution: 4800dpi Constant brightness (fix attachment, no external effect) ★ Flat head Image Scanner 11

  12. Flat Head Image Scanner CIS (Contact Image Sensor) No lens (no aberration) ○ Light, compact, low cost ○ Primary Scanning direction Secondary Scanning Direction The resolution in secondary direction is lower than primary direction × glass Line sensor Light Source Driving shaft (motor, guiderail, timing belt) 12

  13. Sub set(N×N) Sub set (N×N) Pixel Digitalized Pre-deformed Pre-deformed Pre-deformed Scanner Deformed Range Deformed Deformed Digitalized Image Correlation Analyses 13

  14. Concrete Wood Steel 14

  15. Full field scanner sensor 高さ調節ネジ Line sensor turnable Rotary table ラインセンサ shield Fixer Full-field Scanner 15

  16. Smart Scanner Primary dir Rear Front Leg Focal digital meter Window Thermometer(surface) Secondary Micrometer adjuster Thermometer(sensor) Battery Line sensor Linear encoder Scanning bar Stepping motor

  17. Corrosive crack at pier cap

  18. Crack gauge

  19. Studs and mounts Measured data Studs Mounts 19

  20. Smart Scanner installation

  21. Crack width and crack distribution

  22. Stick Scanner development Handy scanner Stick Scanner Development background Core ○Material analyses ×structural destructive Combine pros ×crack broken core Endoscope Full field investigation, small drilled hole ○low cost, constructability ○Micro destructive ×Narrow field

  23. Stick Scanner specifications Compact model Ver.3 Adjuster Spec Sensor ①Range:350mm ②Resolution:600dpi Tablet PC ③Weight:+/- 1kg ④Interface:USB Ver.4:SD card Ver.4 ⑤Scan length: Ver.3=105mm Adjuster Sensor Ver.4=210mm guide