MATC Fall Lecture Series: Steve Garbe
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This document discusses bridge security and health monitoring systems installed on the I-35W bridge in Minnesota. It provides an overview of the basic ITS elements including CCTV cameras, ramp meters, traffic sensors, and dynamic message signs. It then describes the unique elements installed on the bridge, such as forward looking infrared cameras, an anti-icing system, and sensors to monitor the bridge's structural behavior. The document discusses the design and installation of the conduit and fiber optic network supporting these technologies, and how the data is used to monitor the bridge's security and structural health in real-time.
MATC Fall Lecture Series: Steve Garbe
- 1. Bridge Security and Bridge Health Monitoring Presented by Steve Garbe P.E., Iteris
- 2. Clarification If you tuned in to learn a lot about I-74… I apologize!
- 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. Location 4
- 5. Concept to Reality 5
- 6. Rapid Changes • Open Rail for the Outside Barrier • 2 Ponds Introduced • Pedestrian Underpass • Limited ROW along the Bridge approaches
- 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. Conduit Routing • Typical Bridge Deflection of 13 inches • Non-Metallic Conduit can move 2-4” every 100’ due to thermal expansion
- 9. Conduit Routing 4 Conduits in each Bridge Pier for Communications & Power
- 10. Conduit Routing 4 Conduits in each Bridge Pier for Communications & Power
- 11. Conduit Design Significant Design that included multiple systems: Anti-Icing Bridge Security ITS communications 120/240V for ITS Power 480V for Street Lighting
- 12. Conduit Complete
- 13. Anti-Icing Systems Although a pressurized system, portions of the ant-icing are designed on grade.
- 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. Forward Looking Infrared CCTV
- 16. Sensors for Structural Behavior CHLORIDE SENSOR Monitor levels of chlorides in the concrete deck to assist with maintenance activities
- 17. Sensors for Structural Behavior ACCELEROMETER Accelerometers monitor bridge deflections under loads
- 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. 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
- 21. Field Integration Anti-icing pumphouse not large enough for all communication termination and integration. ITS Field Elements Bridge Security IP Addressable Lights
- 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. Questions? CREDITS Click to edit or add your credits Click to edit You may also include a color school logo here. Pick a size and color! Slide design © 2009, Mid-America Transportation Center. All rights reserved.