Seismic Performance and Fragility of Retrofitted Reinforced Concrete Bridge Columns to Long-Duration Earthquakes

Long duration earthquakes are characteristic of the Cascadia Subduction Zone, which has the potential to generate a Magnitude-9.0 earthquake with strong shaking in Washington, Oregon, northern California, and Alaska. The proposed research is focused on characterization of the probability of failure of retrofitted bridge columns due to fatigue fracture of reinforcement under long-duration earthquakes. The proposed research will include the formulation of fatigue fracture models based on actual earthquake strain histories, as previous research on fatigue modeling of reinforcement has used idealized reversed cyclic loading histories. Ongoing research by the PIs on this topic has generated test data for legacy grade 40 reinforcement, typical of 1950s-1970s bridges. The proposed research will include additional testing of modern grade 40 and grade 60 reinforcement to better characterize the influence of earthquake cycle content on fatigue life. Nonlinear time history analyses, incorporating the improved fatigue fracture models, will be conducted for a range of bridges subjected to Cascadia Subduction Zone demands, and results will be used to develop failure fragilities.

• Record URL:
  https://tridurle.wsu.edu/seismic-performance-and-fragility/

Language

• English

Project

• Status: Active
• Funding: $81740
• Contract Numbers:

  69A3551947137

• Sponsor Organizations:

  Transportation Infrastructure Durability & Life Extension

  Washington State University
  Civil & Environmental Engineering
  Pullman, Washington  United States  99164

  Washington State University, Pullman

  Civil & Environmental Engineering Department
  PO Box 642910
  Pullman, WA  United States  99164-2910

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Managing Organizations:

  Transportation Infrastructure Durability & Life Extension

  Washington State University
  Civil & Environmental Engineering
  Pullman, Washington  United States  99164
• Project Managers:

  Kline, Robin

• Performing Organizations:

  Washington State University, Pullman

  Civil & Environmental Engineering Department
  PO Box 642910
  Pullman, WA  United States  99164-2910
• Principal Investigators:

  Phillips, Adam R

  Motter, Christopher J.

• Start Date: 20210601
• Expected Completion Date: 20221220
• Actual Completion Date: 0
• USDOT Program: University Transportation Centers
• Subprogram: Transportation Infrastructure Durability and Life Extension

Subject/Index Terms

• TRT Terms: Bridge anchorages; Earthquake resistant design; Earthquake resistant structures; Earthquakes; Fatigue strength; Reinforced concrete bridges; Retrofitting; Testing; Time duration
• Geographic Terms: Alaska; Northern California; Oregon; Washington (State)
• Subject Areas: Bridges and other structures; Construction; Design; Highways;

Filing Info

• Accession Number: 01773720
• Record Type: Research project
• Source Agency: National Center for Transportation Infrastructure Durability and Life-Extension
• Contract Numbers: 69A3551947137
• Files: UTC, RIP
• Created Date: Jun 5 2021 5:08PM