Comprehensive risk analysis for structure type selection.

Details

• Creators:
  Corotis, Ross B. ; Beams, Bill ; Hattan, David E.
• Corporate Creators:
  Colorado. DTD Applied Research and Innovation Branch
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bridges
  • Bridge substructures
  • Bridge superstructures
  • Types of bridges by design
  • Bridge design
  • Risk assessment
  • Bridges--Colorado--Design and construction
  • Bridges--Risk assessment--Colorado
• Publication/ Report Number:
  CDOT-2010-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Colorado
• Edition:
  Final; June 1, 2007-Jan. 31, 2010.
• Corporate Publisher:
  Colorado. DTD Applied Research and Innovation Branch
• Abstract:
  Optimization of bridge selection and design traditionally has been sought in terms of the finished structure. This study presents a ; more comprehensive risk-based analysis that includes user costs and accidents during the construction phase. Costs for bridge ; projects include actual comprehensive costs, both to the funding agency, the Colorado Department of Transportation (CDOT), and to ; the public at large, including assessments associated with accidents and user delay times during the construction phase. ; Bridges were selected to represent a cross section of structure types, ADT (average daily traffic volumes), bridge overall length and ; CDOT region. A total of 43 bridges were targeted for study, and data were able to be compiled on 20 of these. A questionnaire was ; developed and sent to CDOT bridge personnel, in order to collect general project information as well as detailed information on ; construction duration, construction traffic control plans (including detour types and mileposts, time of day scheduling and speed ; reductions), observed congestion and accidents during construction). ; Graphs compare the delay costs and bridge costs for each structure, and the trends by region, ADT, construction duration and bridge ; type. Accident rates were also compared during construction with those before and after (examining property damage, injuries and ; fatalities). Statistical factor analysis was used to isolate the key factors describing the differences among the bridges studied. ; Structure type and construction duration are the important decision variables with respect to user costs, and these two are related. ; User cost can be reduced by shortening the construction duration for a particular type of structure, or selecting a type that inherently ; has shorter construction duration. For those bridges with an ADT value less than 10,000, the user cost was no more than about 10% ; of the construction cost. Also, for construction durations under 20 months the user cost was no more than 30% of the construction ; cost. For CDOT, concrete box girder prestressed bridges built with current construction practices exhibited user costs more than ; twice as large as construction costs. ; Implementation: The difficulty in obtaining past data suggests that for projects involving high values of ADT, a policy should be ; implemented of contemporaneous records of construction traffic control, including congestion and accidents. These records should ; become a permanent part of the closeout documentation for these projects.
  More +
• Format:
  PDF
• Funding:
  86.00
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/18014/dot_18014_DS1.pdf
• File Type:
  [PDF - 1.08 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b306520c3cd3ffbe71f7b5cbe592b9eac3fbedaa4aeb96b0f3494d67c1b290b5