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:
  • Prestressed concrete bridges
  • Box beams
  • Structural health monitoring
  • Sensors
  • Vibration
  • Load factor
  • Service life
  • Finite element method
  • Condition surveys
• 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.
  More +
• Format:
  PDF
• Funding:
  SJN 134695
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27869/dot_27869_DS1.pdf
• File Type:
  [PDF - 4.15 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:e2a96e58d6540c21ac621b043c17474ad27b5d7ed4823d74e10e7e2b2dca928f