Guidelines for Risk-Based Management of Bridges with Unknown Foundations

There are approximately 580,000 bridges in the FHWA National Bridge Inventory (NBI). The NBI is a collection of key information used to identify and characterize the type, usage, size, location, and condition of bridges in the United States. Approximately 90,000 of the bridges in the NBI have been identified as having unknown foundations. Because of inadequate foundation information, expensive bridge countermeasures are often implemented even though they may not be necessary. However, taking no action at all may involve unacceptable risk. Current methods to investigate unknown foundations are limited and costly. Bridge owners know intuitively that it is often prudent to use countermeasures, monitor sites, or even take the risk of failure rather than use limited resources for costly foundation investigations, especially for bridges with limited remaining service life. Risk-based guidelines are needed to assist bridge owners in determining when a detailed foundation investigation is warranted. If an investigation is warranted, guidelines are needed to assist bridge owners in determining the type of investigation to be conducted considering the applicability and costs of various investigation techniques. If an investigation is not warranted, guidelines are needed to assist bridge owners in determining if a hydraulic or structural countermeasure is warranted, and if so, the level of protection commensurate with the estimated risks. The objective of this research is to develop risk-based guidelines to assist bridge owners in evaluating and prioritizing various courses of action (i.e., investigations, countermeasures, monitoring, rehabilitation, or replacement) for managing bridges with unknown foundations.

Language

  • English

Project

  • Status: Completed
  • Funding: $200000.00
  • Contract Numbers:

    Project 24-25

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Diewald, Walter

  • Performing Organizations:

    GKY and Associates, Incorporated

    Springfield, VA  United States  22151
  • Principal Investigators:

    Stein, Stuart

  • Start Date: 20040616
  • Expected Completion Date: 0
  • Actual Completion Date: 20060915
  • Source Data: RiP Project 9016

Subject/Index Terms

Filing Info

  • Accession Number: 01463110
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 24-25
  • Files: RiP, USDOT
  • Created Date: Jan 3 2013 2:16PM