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:
  • Highway bridges
  • Continuous girder bridges
  • Retrofitting
  • Earthquake resistant design
  • Benefit cost analysis
  • Economic analysis
  • Traffic delays
  • Fiber reinforced concrete
  • Composite materials
  • Assessments
• 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.
  More +
• Format:
  PDF
• Funding:
  OTREC 444
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28955/dot_28955_DS1.pdf
• File Type:
  [PDF - 2.34 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0fa9be4b3eae30f5e9816015ac1bc27786cf785596458c407c56eb67b257c6900357385f322c4261ebe3ddee79f9b71a1ff2ae5d48789582dc0cbd944fef887e