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Mid-America Transportation Center

NDOR Load Rating of Complex Bridges

Final Report
click to download report


Researchers

  • Principal Investigator: George Morcous (gmorcous2@unl.edu 402-554-0571)
  • Co-Principal Investigator: Kromel Hanna (kromelhanna@mail.unomaha.edu
  • Project Status
    Complete
    Sponsors & Partners
  • Nebraska Department of Roads
  • Research Objective
    The objective of this project is to develop the analytical models required for load rating of tied-arch bridges and perform rating factor (RF) calculations for a given set of super-loads.
    Abstract
    The National Bridge Inspection (NBIS) requires each highway department to inspect, assess the condition, and calculate load ratings for structures defined as bridges and located on all public roads. Load rating analysis of bridges is performed to determine the live load that structures can safely carry. Several tools were developed to assist bridge engineers to perform bridge rating in a consistent and timely manner. Bridge Analysis and Rating System (BARS) is an AASHTO licensed product that is used to analyze and rate structures. This program was developed more than twenty years ago and the code was originally written in FORTRAN to run on Mainframe computers. A newer version BARS-PC was developed in 1993 to be used on personal computers. In Nebraska, BARS is being used for rating and super-load analyses. However, the program supports only the rating of conventional bridge systems, such as slab, I-girders box girder and truss bridges. The objective of this project is to develop the analytical models required for load rating of tied-arch bridges and perform rating factor (RF) calculations for a given set of super-loads. The analytical models will be developed for Ravenna Viaduct and Columbus Viaduct using three-dimensional finite elements and the two structures will be analyzed for design loads, legal loads, and permit loads according to the latest AASHTO Load and Resistance Factor Rating (LRFD) manual.
    Project Amount
    $ 23,518