Seismic retrofit benefit considering statewide transportation assessment.

Details

• Creators:
  Mehary, Selamawit Tesfayesus ; Dusicka, Peter
• Corporate Creators:
  Portland State University. Department of Civil & Environmental Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Assessments Benefit Cost Analysis Composite Materials Continuous Girder Bridges Earthquake Resistant Design Economic Analysis Fiber Reinforced Concrete Highway Bridges Retrofitting Traffic Delays
• Publication/ Report Number:
  OR-RD-15-15
• Resource Type:
  Tech Report
• Geographical Coverage:
  Oregon
• Corporate Publisher:
  Oregon. Dept. of Transportation. Research Section ; Oregon Transportation Research and Education Consortium
• Abstract:
  The purpose of this study was to identify and demonstrate a methodology to prioritize bridges for
  
  retrofit in the State of Oregon. Given the limited resources available, retrofitting all vulnerable bridges in the foreseeable
  
  future would not be impractical. Instead, a retrofit strategy needs to be developed to prioritize the inventory and enumerate
  
  the retrofit cost. In this study, a prioritization methodology used a holistic assessment of overall roadway system to consider
  
  highway route segments, rather than individual bridges. The overall assessment was based on a cost-benefit analysis
  
  including retrofit cost, expected economic loss (with or without retrofit) and social loss caused by system wide travel time
  
  delays.
  
  A review of 2010 ODOT bridge inventory suggested that a continuous concrete girder bridge (CCGS) with three
  
  spans could be utilized to represent a sizeable portion of vulnerable inventory for Oregon highways bridges. After reviewing
  
  several potential retrofit measures, carbon fiber composite material was selected for retrofit of vulnerable columns
  
  representing those built from the 1950s to mid-1970s. Four full-scale typical square columns were tested to failure. The
  
  results showed that despite the intentionally selected square geometry of the reinforced concrete columns, the CFRP
  
  composite material showed to be an effective retrofit measure and could be deployed for to address this deficiency.
  
  The software package REDARS2 was used for seismic risk analysis (SRA) of the highway network in this study. This
  
  platform was adopted to simulate the impact of scenario earthquakes in an effort to assess the expected benefit considering
  
  direct bridge costs as well as social costs from traffic induced delays resulting from seismic retrofitting of a particular bridge
  
  type. The assessment considered three scenario Cascadia Subsection Zone earthquakes of magnitudes 9.0, 8.5 North, and,
  
  8.5 South. The study area included all highway routes west of the I-5 corridor, highway routes in the Portland area, the
  
  entire length of US-101 and extending partially east on I-84 Columbia River Highway. Due to the considerations of a single
  
  bridge type and other limitations identified in the seismic analysis software (REDARS2), the retrofit assessment outcomes
  
  should be regarded as a first order estimate.
  
  
• Format:
  PDF
• Funding:
  OTREC 444
• Collection(s):
  University Transportation Centers US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0fa9be4b3eae30f5e9816015ac1bc27786cf785596458c407c56eb67b257c6900357385f322c4261ebe3ddee79f9b71a1ff2ae5d48789582dc0cbd944fef887e
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28955/dot_28955_DS1.pdf
• File Type:
  [PDF - 2.34 MB ]