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Advanced bridge safety initiative : investigation of floor beam performance in three steel through-truss bridges - task 7.

File Language:
English


Details

  • Creators:
    Goslin, Keenan ; Davids, Bill
  • Corporate Creators:
    University of Maine. Advanced Structures and Composites Center
  • Subject/TRT Terms:
  • Publication/ Report Number:
    ME 14-12
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Maine
  • Corporate Publisher:
    Maine. Dept. of Transportation
  • Abstract:
    The Advanced Structures and Composites Center at the University of Maine (UMaine) performed live load testing ; and rating adjustment factor analysis for three truss bridges. The Maine Department of Transportation (DOT) ; indicated that the floor beams are not sufficient for carrying the legal loads for these bridges. Each bridge is a steel ; through-truss bridge with floor beams, stringers and a variable depth concrete slab that was not designed to be ; composite with the steel framing. The bridges were all located in Maine in Brownville, Chester and T-3 Indian ; Purchase. Live load testing was conducted on April 8th, April 10th and April 15th, 2014 by UMaine with assistance ; from Maine DOT personnel to evaluate the performance of typical floor beams. Stringers were considered to be of ; secondary concern to the Maine DOT, and were not heavily instrumented. ; The strain measurements were consistent, and the results appear reliable. Measured floor beam strains were less than ; expected based on a lever rule analysis for live load distribution. If the MaineDOT agrees with our assessment, a ; conventional, lever rule load rating of the floor beams for these three structures that accounts for the condition of the ; floor beams including section losses must be completed. The rating factors determined from these analyses can then ; be increased by the values of K reported. Any existing cracking near copes or connections and remaining fatigue life ; have not been considered as part of this analysis, and should also be considered given the age of these structures.
  • Format:
    PDF
  • Funding:
    20100506*5729
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/28486/dot_28486_DS1.pdf
  • File Type:
    Filetype[PDF - 8.07 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha256:36d18c5a9c4891a4e593a64cddf12a29ec565bffb6138ffed9f9c829ef4847aa
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