Download - BRIDGE INFRASTRUCTURE PRESERVATION
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
-4,0
-3,5
-3,0
-2,5
-2,0
-1,5
-1,0
-0,5
0,0
0,5
1,0
0 0,5 1 1,5 2 2,5 3
Str
ain
(V
)
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
