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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. - PowerPoint PPT Presentation
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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 NETHERLANDSBELGIUM
GERMANY
FRANCE
SLOVENIASWITZERLAND
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 strain 3-axle truck
Theoretical strain 3-axle truck
Theoretical IL
Calibrated measured IL
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
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
Considerations
• Requires suitable bridge and location• Most successful on short, stiff bridges• Structural assessments require transducer calibration• Calibration may require specialized expertise
Estimated Cost• $100,000 - $130,000 per bridge/system• Varies by sensor type, on-site communication requirements
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Str
ain
(V
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Static
Dynamic
SUPPORTING TECHNOLOGIES
Archived Records Database
Functions
• Supports data-driven enforcement scheduling
• 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 SystemComputer
Interface/Software
Voltage/Axle Sensors(X Weight Accuracy)
Database
IMPLEMENTATION
STRUCTURAL ASSESSMENTS
SAFETY ASSESSMENTS
Archived Records Database
Bridge WIM System
Database
Computer Interface/Software
Voltage/Axle Sensors(X Weight Accuracy)
Computer Interface/Software
Voltage/Axle Sensors(X Weight Accuracy)
Database
IMPLEMENTATION
STRUCTURAL ASSESSMENTS
SAFETY ASSESSMENTS LOAD TESTING
Archived Records Database
Bridge WIM System
DatabaseDatabase
Computer Interface/Software
Voltage/Axle Sensors(X Weight Accuracy)
Computer Interface/Software
Voltage/Axle Sensors(X Weight Accuracy)
Database
Computer Interface/Software
Voltage/Axle Sensors(X Weight Accuracy)
BENEFITS
FUNCTIONAL INTERFACE
QUESTIONS
