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MATC 2012 Fall Lecture Series
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Bridge Security and Bridge Health Monitoring
Presented bySteve Garbe P.E., Iteris
Clarification
If you tuned in to learn a lot about I-74… I apologize!
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
5
Concept to Reality
Rapid Changes
• Open Rail for the Outside Barrier
• 2 Ponds Introduced
• Pedestrian Underpass
• Limited ROW along the Bridge approaches
Concept to Reality
48 Fiber Optic Cable on the West Side of the Bridge96 Fiber Optic Cable on the East Side of the Bridge
• Typical Bridge Deflection of 13 inches
• Non-Metallic Conduit can move 2-4” every 100’ due to thermal expansion
Conduit Routing
Conduit Routing 4 Conduits in each Bridge Pier
for Communications & Power
Conduit Routing 4 Conduits in each Bridge Pier for
Communications & Power
Significant Design that included multiple systems:
Anti-IcingBridge SecurityITS communications120/240V for ITS Power480V for Street Lighting
Conduit Design
Conduit Complete
Although a pressurized system, portions of the ant-icing are designed on grade.
Anti-Icing Systems
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.
Forward Looking Infrared CCTV
Forward Looking Infrared CCTV
Sensors for Structural BehaviorCHLORIDE SENSOR
Monitor levels of chlorides in the concrete deck to assist with maintenance activities
Sensors for Structural BehaviorACCELEROMETER
Accelerometers monitor bridge deflections under loads
Sensors for Structural BehaviorLINEAR POTENTIOMETER
Placed at expansion joints and bearings to measure bridge movements which can be compared to expected values
Vibrating wire strain gauges, installed in select locations, will measure how the bridge is resisting loads and also the
temperature of the concrete
Sensors for Structural Behavior VIBRATING WIRE STRAIN GAUGES with TEMPERATURE
Truck Loading Calibration
Anti-icing pumphouse not large enough for all communication termination and integration.
Field Integration
ITS Field ElementsBridge SecurityIP Addressable Lights
• The benefit of these type systems is significant:
Real-Time DataResearch
Program for Technology
• The cost is typically less than 2% of a large river bridge replacement.
Slide design © 2009, Mid-America Transportation Center. All rights reserved.
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