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B-WIM for Bridge Enforcement and Structural Safety

B-WIM for Bridge Enforcement and Structural Safety. Department of Civil, Construction, and Environmental Engineering. UTCA. Objectives. B-WIM system to control heavy vehicle overloads , to elaborate the suitable bridge types, and how to design instrumentation.

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B-WIM for Bridge Enforcement and Structural Safety

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  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 reducingunnecessary 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, SwedenJune 1997 D+/C/C C/B/C B/B/C

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

  7. Modular build signal processing unit

  8. 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

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

  10. Calibration

  11. Discusion

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

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

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

  15. SiWIM for pre-selection

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

  17. Application for special transport

  18. 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.

  19. *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 (http://www.eng.uab.edu/cee/faculty/bwim/)

  20. 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) Bridge Weigh-in-Motion (B-WIM) System Testing and Evaluation

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