Determination of Recovery Bridge Corridors by Comparing Post EQ Network

Details

• Creators:
  Soga, Kenichi ; Wang, Ziqi ; Becker, Tracy C. ; Zhao, Bingyu ; Li, Pengshun
• Corporate Creators:
  University of California, Berkeley. Pacific Earthquake Engineering Research Center
• Corporate Contributors:
  California. Department of Transportation
• Subject/TRT Terms:
  Alternatives Analysis Case Studies Computer Networks Earthquakes Highway Bridges Highway Corridors Rural Areas Statistical Ranking Stochastic Processes Travel By Area Urban Areas Visualization

  More +
• Publication/ Report Number:
  CA25-3798
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; California
• Edition:
  Final Report: June 01, 2022 - February 28, 2025
• Corporate Publisher:
  California. Department of Transportation
• Abstract:
  This study focuses on Caltrans District 4 in the San Francisco Bay Area (Alameda, Contra Costa, Marin, Napa, San Francisco, Santa Clara, San Mateo, Solano, and Sonoma). It proposes a framework to identify and prioritize critical bridge corridors that enable access to emergency facilities, including hospitals, fire stations, police stations, Caltrans maintenance facilities, airports, seaports, and ferry terminals. Bridges are first grouped into corridors using an interchange-based approach. Next, a shortest-path algorithm is applied to find routes from each zip-based zone to its nearest facility of each type. Corridor “usage” is computed from how frequently corridors appear on these access routes, and total usage is used to rank corridor criticality. Bridges within top corridors are then evaluated and ranked using damage probabilities. The proposed method is validated against Google Maps, showing 5.6% route dissimilarity, indicating that access to critical facilities strongly depends on Caltrans routes. Corridor importance varies by facility type because facility distributions differ. For example, District 4 contains 563 fire stations across 298 zones, so most zones access a fire station locally and only 31 zones require Caltrans bridges, whereas 159 zones require Caltrans bridges to reach hospitals. The study also compares corridor rankings with and without population weighting. Without population, top corridors often occur in rural areas that serve as sole connectors for multiple zones; adding population shifts priorities toward densely populated areas, highlighting the need to define planning objectives. An updated methodology is proposed to remove selected corridors and recomputes rankings to test impacts, showing rural corridors are often irreplaceable while urban networks are highly redundant. Finally, another optimization method is introduced to minimize the number of Caltrans bridges used, trading off travel time to reduce recovery designations and costs. A web-based platform implements and visualizes these methods.
• Format:
  PDF
• Funding:
  65A0774 TO 007
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:4ee67b4355e5043d35ef50226d680372d7feb0ca219e2299765582cb574324a29c9114168b5a5ac1ab02343d75d8f4d9b41de282a7e1a3def5e5c639a62df258
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/90479/dot_90479_DS1.pdf
• File Type:
  [PDF - 3.69 MB ]