National governments must provide guidance on general needs of the bridge stock at an aggregate level. National agencies are beginning to invest in decision support systems assisting in this planning process. The paper summarizes two current efforts in this area undertaken in the U.S. and Sweden in the form of design and implementation of bridge management systems. Both systems feature interactive real-time "What-If" analysis based on optimization and simulation of the process of budget allocation for the national stock of bridges over a long-term period. Budget is allocated to satisfy the needs for maintenance, repair and rehabilitation as well as to correct the functional deficiencies of the bridges. The purpose of the systems is to simulate the influence of the policy factors on the network performance over a substantial time horizon for multiple measures of effectiveness. Bridge population is broken down into strata groups following the stratification schemes accepted by the two agencies. The results of the simulation are obtained in a compact parametric form suitable for the "What-If" analysis. Proposed projects are grouped and prioritized by their benefit/cost ratios using the agency-specific evaluation models. "What-If" analysis is performed in real time, making it possible to see immediately the results of the given policy. Analysis is based on interactive graphical interface that allows user to set targets, vary budget levels and monitor network performance in both graphical and tabular form.


  • English

Media Info

  • Features: Figures;
  • Pagination: 15p

Subject/Index Terms

Filing Info

  • Accession Number: 00763153
  • Record Type: Publication
  • Report/Paper Numbers: G-2, IBMC-059
  • Files: TRIS, TRB
  • Created Date: Apr 29 1999 12:00AM