Review and revision of overload permit classification.
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Review and revision of overload permit classification.

Filetype[PDF-4.39 MB]


  • English

  • Details:

    • Corporate Creators:
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    • Edition:
      Final report.
    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ; NTL-FREIGHT-Trucking Industry ; NTL-SAFETY AND SECURITY-Highway Safety ;
    • Abstract:
      The Michigan Department of Transportation (MDOT) allows trucks that exceed their legal loads to cross

      bridges if they apply and are approved for a permit. More than 30,000 permits have been processed each

      year since 2002, providing a vital service to Michigan's economy. However, the permitting system must

      be robust enough to ensure that the safety of the motoring public is maintained by accounting for

      overload vehicles without unduly restricting commerce.

      Currently, structures are placed into Overload Class by checking all service limit states as identified by

      the 2005 MDOT Bridge Analysis Guide (BAG) with 2009 Interim Updates and the 2010 American

      Association of State Highway and Transportation Officials (AASHTO) Manual for Bridge Evaluation (MBE)

      with interims. Vehicles are placed into the Overload Class by comparing the maximum moments of the

      vehicle for span lengths between 15-ft to 160-ft to the moments produced by the 20 standard overload

      configurations provided by the BAG. Structures that do not pass an overload class would be marked as

      restricted and require a specific analysis, increasing the turn-around time for the client and the analysis

      cost incurred by MDOT.

      The current software used for the analysis of the structures is a simplified solution that was developed

      well over 20 years ago when more robust solutions were not feasible. With the capability of modern

      computing and the availability of bridge software solutions, this research project looks at solutions for

      updating the bridge analysis as well as the overall overload permit classification process.

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