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BRIDGE INFRASTRUCTURE
PRESERVATION
CURRENT CHALLENGES
Significant Growth in CMV Traffic
• Increased congestion and delay
• Demand for larger and heavier vehicles
• Mounting stress on infrastructure
• Greater need for effective and efficient enforcement
CURRENT CHALLENGES
Bridge Infrastructure Deterioration
• 72,500 U.S. bridges “structurally deficient”
• $65.3 billion repair estimate
• Inexact methods to reduce, refine, prioritize actions
– Uncertainties in traffic loading
– Uncertainties in bridge response
BACKGROUND
2006 European Scan Tour
• Emerging technologies
• Unconventional procedures
• Novel data
applications
• Innovative funding
mechanisms
• Multinational
harmonization
THE NETHERLANDS
BELGIUM
GERMANY
FRANCE
SWITZERLAND
SLOVENIA
EUROPEAN APPROACH
Technology-based Policies/Procedures
• Structural/safety assessment
– Slovenia, France enhance the accuracy of bridge safety
conclusions through direct measurements
• Load testing
– Slovenia uses “soft”
load testing
Measured IL
Calibrated
measured IL
Theoretical IL
Calibrated strain
3-axle truck
Theoretical strain
3-axle truck
SUPPORTING TECHNOLOGIES
• Overheight Vehicle Detection System
• Vehicle Profiler System
• WIM Systems
– In-road
– Bridge
• Dynamic Calibration Vehicle
• Vehicle Identification System
• Advanced Routing/Permitting System
• Archived Records Database
SUPPORTING TECHNOLOGIES
Bridge WIM System
•
•
Considerations
•
•
Estimated Cost
Requires suitable bridge and location
Most successful on short, stiff bridges
Structural assessments require transducer calibration
Calibration may require specialized expertise
• $100,000 - $130,000 per bridge/system
• Varies by sensor type, on-site communication requirements
1,0
0,5
0,0
-0,5
Strain (V)
Functions
• Measures, records weight using existing structures
instrumented with strain transducers/gauges
• Measures, records axles using traditional sensors or
Nothing-on-Road/Free-of-Axle Detector (NORFAD) systems
-1,0
-1,5
-2,0
-2,5
-3,0
Static
-3,5
Dynamic
-4,0
0
0,5
1
1,5
Time (s)
2
2,5
3
SUPPORTING TECHNOLOGIES
Archived Records Database
• Supports data-driven enforcement scheduling
Functions
• Supports preventative carrier contacts
• Supports enhanced data quality
• Encourages long-term performance monitoring
Considerations
• Requires procedures for quality control
Estimated Cost
• $225,000 - $300,000
IMPLEMENTATION
STRUCTURAL
ASSESSMENTS
Archived Records
Database
Bridge WIM System
Database
Voltage/Axle Sensors
(X Weight Accuracy)
Computer
Interface/Software
IMPLEMENTATION
Archived Records
Database
Bridge WIM System
STRUCTURAL
ASSESSMENTS
SAFETY ASSESSMENTS
Database
Database
Voltage/Axle Sensors
(X Weight Accuracy)
Voltage/Axle Sensors
(X Weight Accuracy)
Computer
Interface/Software
Computer
Interface/Software
IMPLEMENTATION
Archived Records
Database
Bridge WIM System
STRUCTURAL
ASSESSMENTS
SAFETY ASSESSMENTS
LOAD TESTING
Database
Database
Database
Voltage/Axle Sensors
(X Weight Accuracy)
Voltage/Axle Sensors
(X Weight Accuracy)
Voltage/Axle Sensors
(X Weight Accuracy)
Computer
Interface/Software
Computer
Interface/Software
Computer
Interface/Software
BENEFITS
FUNCTIONAL INTERFACE

QUESTIONS