Socio-economic effect of seismic retrofit implemented on bridges in the Los Angeles highway network.

Details

• Creators:
  Shinozuka, Masanobu ; Zhou, Youwei ; Kim, Sanghoon ; Murachi, Yuko ; Banerjee, Swagata ; Cho, Sunbin ; Chung, Howard
• Corporate Creators:
  University of California, Irvine. Department of Civil and Environmental Engineering
• Subject/TRT Terms:
  • Bridges
  • California
  • Los Angeles Region
  • Maintenance and repair
  • Costs
  • Earthquake effects
  • Earthquake resistant design
  • Externalities (Economics)
• Publication/ Report Number:
  CA06-0145
• Resource Type:
  Tech Report
• Geographical Coverage:
  Los Angeles (California)
• Corporate Publisher:
  California. Department of Transportation
• Abstract:
  This research studied socio-economic effect of the seismic retrofit implemented on bridges in Los Angeles Area ; Freeway Network. Firstly, advanced FE (Finite Element) modeling and nonlinear time history analysis are carried out to ; evaluate the seismic performance in the form of fragility curve, of representative bridges before and after retrofit. This ; analysis resulted in the determination of retrofit effect in such a way that we can quantify, through the change in fragility ; parameters, the improvement of bridge seismic performance after retrofit. Secondly, an integrated traffic assignment ; model is introduced to consider change in the post-earthquake OD characteristics due to building damage, and is utilized ; to evaluate the post-earthquake network performance of the damaged freeway network in terms of daily travel delay ; (compared with the travel time associated with the freeway network not damaged) and attendant opportunity cost. ; Furthermore, the process of system restoration is simulated to estimate the total social cost based on bridge functionality ; restoration (repair / replacement) process. The benefit from the retrofit is defined as the combined social and bridge ; restoration cost avoided by comparing the total social and bridge restoration cost before and after bridge retrofit. The ; benefit resulting from combined social and bridge restoration cost avoided together with the bridge retrofit cost are used ; for a cost-benefit analysis. The result shows that the retrofit is cost-effective if both social and bridge restoration cost ; avoided are considered, and the bridge restoration cost avoided can only contribute a small portion of the initial bridge ; retrofit cost.
  More +
• Format:
  PDF
• Funding:
  DRI Research Task No. 0145 ; Contract No. 59A0304
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27709/dot_27709_DS1.pdf
• File Type:
  [PDF - 6.35 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:12a5bf16affdd23ea2873bbcff31fcc26cbee1e15bba6c94a1d10d1b30fa2e06