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

Details

• Creators:
  Goslin, Keenan ; Davids, Bill
• Corporate Creators:
  University of Maine. Advanced Structures and Composites Center
• Subject/TRT Terms:
  Beams Live Loads Load Tests Steel Bridges Strain Measurement Truss Bridges
• 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
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:36d18c5a9c4891a4e593a64cddf12a29ec565bffb6138ffed9f9c829ef4847aa
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28486/dot_28486_DS1.pdf
• File Type:
  [PDF - 8.07 MB ]