A Comparison of AASHTO Bridge Load Rating Methods (2011) / Chapter Skim
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S U M M A R Y This report highlights the work accomplished under the AASHTO sponsored project, "Evaluation of Load Rating by Load and Resistance Factor Rating." Administered by NCHRP as Project 12-78, the research has provided proposals for changes to the AASHTO Manual for Bridge Evaluation through the extensive data analysis of 1,500 bridges of varying material types and structure configurations. The bridges were analyzed using the AASHTOWare™ Virtis® software.
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2The bridge types analyzed using Virtis® for the basis of this research are: • Simple Span – Steel Rolled Beam – Steel Built-Up Beam – Steel Plate Girder – Prestressed I-beam – Prestressed Box Beam – Reinforced Concrete T-Beam – Reinforced Concrete Slabs • Multiple Spans – Steel Rolled Beam – Steel Plate Girder – Reinforced Concrete Slab – Prestressed I-beam Exporting the critical rating and corresponding results to an external spreadsheet permitted the analysis of the data for trends. The bulk of this research discusses the results of that analysis and the changes suggested to the AASHTO Manual for Bridge Evaluation.
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