1. B-WIM for Bridge Enforcement and Structural Safety
Department of Civil, Construction, and Environmental Engineering
UTCA

2. Objectives
B-WIM system to control heavy vehicle overloads, to elaborate the suitable bridge types, and how to design instrumentation.
B-WIM can reduce uncertainties in the traffic load assessment and optimize the allocation of available funding for bridge maintenance
Freight planning purposes

3. where:
Q: predicted maximum live load effect, a-deterministic value relating the load effect to a reference loading scheme; W.95- characteristic vehicle weight; H-headway factor; m-factor reflecting the variations of load effects; I-impact factor; g-lateral distribution factor

4. The potential benefits …
Improved:
delivery of enforcement services by enhancing effectiveness and efficiency;
reduction in the total number of vehicle required to stop for enforcement purposes;
emissions by reducing unnecessary deceleration, idling
controlling of the operation of non-permitted, non-compliant (i.e., overweight or oversized) vehicles; and
ongoing performance monitoring and evaluation of vehicle size and weight.
freight planning

5. CET test – Luleå, Sweden June 1997
C/B/C
D+/C/C
B/B/C

6. BWIM shema
SiWIM Bridge
Weigh-in-motion
system

9. Modular build signal processing unit

11. Advantages Mobile Very good accuracy Quick installation Reliable
No influence in the pavement
No road block
Low rate for maintenance
Price efficient
Specifications and traffic volume do not give satisfactory traffic loads results
Bridge safety can be calculated more efficiently with SiWIM system

12. Test Plan select the bridge install the system
create the influence line
calibration
data processing for reports
de-install the system

13. Calibration

14. Discusion

15. Results for each vehicle
Axle load for individual axle
Gross vehicle weight
Axle distance
Speed
Class
Exact time (2/1000 s)
Temperature

16. Data can be used for traffic analyses and freight planning
maintenance planning
pre-selection for static weighing
monitoring of overload vehicles trying to avoid static weighing session
bridge applications (max. load...)

17. Maintenance sector and law enforcement
1. For critical road sections where overloading is a SERIOUS problem (quarries, sections under construction....)

18. SiWIM for pre-selection

19. Bridge applications safety assessment of existing bridges
assessment of dynamic effects
aplication for special transport

20. Application for special transport

21. Evaluate bridge maintenance issues with the proposed bridge WIM system:
Investigated to provide synchronized data on the traffic load effects and the induced stresses and strains, and therefore become a part of “Intelligent Bridge Monitoring Systems” to optimize the allocation of funds for bridge repair or replacement and to reduce the corresponding traffic disruption.
Bridge WIM gives the essential information to calculate the realistic traffic loading Q, and allows for reducing the live load safety factor γQ, which both increase the safety of the structure.

22. *Process of collaboration is started with a French group of researchers who are working on multi-span and multilane bridge structures
**The information on the project including final report will be posted at (

24. Bridge Weigh-in-Motion (B-WIM) System Testing and Evaluation
Eighteen Month Project
Multi-Campus Research Team
Diverse Project Advisory Group
PI: Dr. Wilbur (Bill) Hitchcock (UAB)
Co-PIs:
Dr. Nasim Uddin (UAB)
Dr. Virginia Sisiopiku (UAB)
Dr. Jason Kirby (UAB)
Dr. Talat Abu-Amra (UAB)
Dr. Jim Richardson (UA)
Dr. Houssam Toutanji (UAH)