MATC Fall Lecture Series: Steve Garbe

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MATC 2012 Fall Lecture Series

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MATC Fall Lecture Series: Steve Garbe

  1. 1. Bridge Security and Bridge Health Monitoring Presented by Steve Garbe P.E., Iteris
  2. 2. Clarification If you tuned in to learn a lot about I-74… I apologize!
  3. 3. I-35W Overview• Basic ITS Elements – 4 CCTV – 2 Ramp Meters – 1 Traffic Monitoring Location – 1 Existing DMS – 1 Existing Traffic Monitoring Location• Unique Elements – 2 FLIR Cameras – Anti-Icing System – Bridge Security – SMART Bridge System – Aesthetic Lighting
  4. 4. Location 4
  5. 5. Concept to Reality 5
  6. 6. Rapid Changes • Open Rail for the Outside Barrier • 2 Ponds Introduced • Pedestrian Underpass • Limited ROW along the Bridge approaches
  7. 7. Concept to Reality 48 Fiber Optic Cable on the West Side of the Bridge 96 Fiber Optic Cable on the East Side of the Bridge
  8. 8. Conduit Routing• Typical Bridge Deflection of 13 inches• Non-Metallic Conduit can move 2-4” every 100’ due to thermal expansion
  9. 9. Conduit Routing  4 Conduits in each Bridge Pier for Communications & Power
  10. 10. Conduit Routing  4 Conduits in each Bridge Pier for Communications & Power
  11. 11. Conduit DesignSignificant Design that includedmultiple systems: Anti-Icing Bridge Security ITS communications 120/240V for ITS Power 480V for Street Lighting
  12. 12. Conduit Complete
  13. 13. Anti-Icing Systems Although a pressurized system, portions of the ant-icing are designed on grade.
  14. 14. Forward Looking Infrared CCTV MnDOT FLIR REQUIREMENTS:• 1. System will detect and validate motion based on object size and trajectory. 2. System must be able to detect motion from cameras using minimum of 7 pixels. 3. System must be able to track objects in motion with both fixed cameras and pan tilt zoom cameras with extraneous motion in the background. 4. System must be able to detect, validate and track objects using thermal imaging cameras at ranges of at least 1470 feet.
  15. 15. Forward Looking Infrared CCTV
  16. 16. Sensors for Structural Behavior CHLORIDE SENSOR Monitor levels of chlorides in the concrete deck to assist with maintenance activities
  17. 17. Sensors for Structural Behavior ACCELEROMETER Accelerometers monitor bridge deflections under loads
  18. 18. Sensors for Structural Behavior LINEAR POTENTIOMETER Placed at expansion joints and bearings to measure bridge movements which can be compared to expected values
  19. 19. Sensors for Structural Behavior VIBRATING WIRE STRAIN GAUGES with TEMPERATURE Vibrating wire strain gauges, installed in select locations, will measure how the bridge is resisting loads and also the temperature of the concrete
  20. 20. Truck Loading Calibration
  21. 21. Field Integration Anti-icing pumphouse not large enough for all communication termination and integration.ITS Field ElementsBridge SecurityIP Addressable Lights
  22. 22. Program for Technology • The benefit of these type systems is significant: Real-Time Data Research • The cost is typically less than 2% of a large river bridge replacement.
  23. 23. Questions? CREDITSClick to edit or add your credits Click to editYou may also include a color school logo here. Pick a size and color!Slide design © 2009, Mid-America Transportation Center. All rights reserved.

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