Advanced bridge safety initiative, task 3 : slab bridge load rating using AASHTO methodology and finite element analysis - an analysis of 20 bridges.
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Advanced bridge safety initiative, task 3 : slab bridge load rating using AASHTO methodology and finite element analysis - an analysis of 20 bridges.

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  • Creators:
  • Corporate Creators:
    University of Maine
  • Subject/TRT Terms:
  • Publication/ Report Number:
    ME 14-07
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Maine
  • Corporate Publisher:
    Maine. Dept. of Transportation
  • Abstract:
    Current AASHTO provisions for the conventional load rating of flat slab bridges rely on the equivalent strip method

    of analysis for determining live load effects, this is generally regarded as overly conservative by many professional

    engineers. As a result there are a significant number of slab bridges in Maine that are (or will be) posted for reduced

    truck weights, when in reality such postings may not be necessary.

    In Tasks 1 and 2 of this study a program called SlabRate is developed and validated. SlabRate computes the rating

    factors for simply-supported, continuous flat slab bridges using finite element analysis (FEA).

    This report under Task 3 explores the potential benefits of using SlabRate over the conventional strip width, twenty

    existing bridges were load rated using both. Twenty one different truck configurations were analyzed, these include

    AASHTO’s design and legal trucks, along with AASHTO’s specialized hauling vehicles and MaineDOT’s rating

    trucks.

    It was also concluded that SlabRate can be reliably used to load rate flat slab bridges having skew angles of 20° or

    less. Only fourteen bridges of the original twenty bridges met this criteria, of which seven would have rating factors

    above one using SlabRate while below one using the conventional strip width method.

  • Format:
    PDF
  • Funding:
    20100506*5729
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