Bridge condition assessment and load rating using dynamic response.

Details

• Creators:
  Islam, AKM Anwarul ; Li, Frank ; Hamid, Hiwa ; Jaroo, Amer
• Corporate Creators:
  Youngstown State University
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Box Beams Condition Surveys Finite Element Method Load Factor Prestressed Concrete Bridges Sensors Service Life Structural Health Monitoring Vibration
• Publication/ Report Number:
  FHWA/OH-2014/7
• Resource Type:
  Tech Report
• Geographical Coverage:
  Ohio
• Corporate Publisher:
  Ohio. Dept. of Transportation. Office of Statewide Planning and Research
• Abstract:
  This report describes a method for the overall condition assessment and load rating of prestressed box beam
  
  (PSBB) bridges based on their dynamic response collected through wireless sensor networks (WSNs). Due to a
  
  large inventory of deficient and aging bridges in the United States, the health monitoring of bridges can be very
  
  expensive; therefore, new tools for quick, efficient and response-based condition assessment and load rating of
  
  bridges will be helpful. The hypothesis is based on the assumption that the health of a bridge is associated with
  
  its vibration signatures under vehicular loads. Two WSNs were deployed on a 25-year old PSBB bridge under
  
  trucks with variable loads and speeds, and its dynamic response was collected at the current condition. The
  
  acceleration response of the bridge at its newest condition was collected from dynamic simulations of its full-scale finite element analysis (FEA) models mimicking field conditions. The FEA bridge model was validated by
  
  the field testing and numerical analysis. The acceleration data in time domain were transformed into frequency
  
  domain using Fast Fourier Transform to determine peak amplitudes and corresponding fundamental
  
  frequencies for the newest and current conditions. The analyses and comparisons of the bridge dynamic
  
  response between the newest and the current bridge interestingly indicate a 37% reduction in its fundamental
  
  frequency over 25 years of service life. This frequency reduction is linked to the reduction in condition rating of
  
  the current bridge. The analysis data, bridge structural dynamics and bridge geometric parameters have been
  
  used to calculate the in-service stiffness of the bridge to estimate its load bearing capacity. Using the results
  
  and algorithms from this research, application software is developed to instantly estimate the overall condition
  
  rating and load bearing capacity of a PSBB bridge under vehicular loads. The research outcome and the
  
  software will help in performing quick and cost-effective condition assessment and load rating of PSBB bridges,
  
  and may provide a better ability to plan replacements and develop load ratings.
  
  
• Format:
  PDF
• Funding:
  SJN 134695
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:e2a96e58d6540c21ac621b043c17474ad27b5d7ed4823d74e10e7e2b2dca928f
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27869/dot_27869_DS1.pdf
• File Type:
  [PDF - 4.15 MB ]