Verification of Texas superheavy load criteria for bridges.

Details

• Alternative Title:
  Project title: Evaluation of superheavy load criteria for bridges
• Creators:
  Bourland, Mark C. ; Chang, Byungik ; Jao, Mien
• Corporate Creators:
  Lamar University
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Bridges Bridges--Live Loads--Texas Live Loads Loads
• Publication/ Report Number:
  FHWA/TX-12/0-6438-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report; Sept. 2010¿Aug. 2011.
• Abstract:
  This report evaluates TxDOT criteria for the superheavy loads that trigger bridge analyses to determine
  
  whether the criteria adequately protects Texas bridges. Researchers used solid modeling calibrated with a
  
  bridge test of a 3-span continuous steel girder unit of SH 159. The bridge testing measured girder end
  
  rotations with tilt loggers and load position using a sub-foot accuracy GPS. Solid modeling was done with
  
  ANSYS 12. The calibrated model was used to conduct a parametric study. Axle distribution factors of 0.28
  
  and 0.45 were experimentally determined for interior and exterior girders respectively. Results of the
  
  parametric study showed that the Texas superheavy load criteria are valid for this bridge type. A study of
  
  service life extension showed that operational stress level loads applied as little as 5 percent of time to a
  
  particular structure will have a significant effect on the lifetime of the structure, and that the number of
  
  fatigue load-cycles per truck cannot be assumed to be one. A graphical version of the bridge review trigger
  
  (load-length curve with existing allowances and restrictions) might serve TxDOT and heavy-haul carriers
  
  better than does the gross vehicle weight triggers. Data collected long term of load frequency and load level
  
  from a relevant bridge would help TxDOT determine what effects stress level variations have on the life of
  
  Texas bridges.
  
  
• Format:
  PDF
• Funding:
  Project 0-6438
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:81f6f58c842cb72ea36fa374f1b9d53589d8c67ea57669e2c7fa9bc976b7c00f
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23855/dot_23855_DS1.pdf
• File Type:
  [PDF - 48.35 MB ]