USE OF LIFE CYCLE COSTS IN BRIDGE PLANNING AND DESIGN

An analytical approach for bridge life cycle cost analysis and the selection of the most cost-effective bridge maintenance, rehabilitation and/or replacement (MR&R) strategy is presented. A parameter, which incorporates age, condition rating and cost, called the "value index" (VI), is used as a basis for comparing various bridge MR&R strategies. The bridge rating data is used as a basis to incorporate the condition of a bridge in the model. Using an optimization approach, the VI and bridge deterioration as a function of time are used to permit rational decisions to be made about scheduling and the type of bridge work to be executed. Using the VI and the present worth (PW), the option with the greatest VI and the smallest PW is taken to be the most desirable one. Although the VI is related to the PW and the optimum VI corresponds to the minimum PW, such constraints as the number of bridge work alternatives, anticipated service life and desired minimum condition rating may give rise to several different optima. In most cases, the scheduling of bridge works can be used as the most critical decision-making step in minimizing the cost. The results from the case studies presented in this study indicate that a minimum cost option is not necessarily the most desirable one. In certain applications it may be desirable to increase the cost so that the time between consecutive bridge works can be lengthened.

  • Supplemental Notes:
    • Sponsored by the Illinois Transportation Research Center.
  • Corporate Authors:

    Illinois Institute of Technology

    Department of Civil Engineering, 3201 South Dearborn Street
    Chicago, IL  United States  60616-3793
  • Authors:
    • Mohammadi, J
    • Guralnick, S A
    • Yan, L
  • Publication Date: 1996-5

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 183 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00724545
  • Record Type: Publication
  • Report/Paper Numbers: ITRC FR 92-1,, Final Report
  • Files: TRIS
  • Created Date: Aug 8 1996 12:00AM