Evaluation of Fatigue on the Serviceability of Highway Bridges

<div><div><font size="3"></font></div><font size="3">The <em>AASHTO Guide Specifications for Fatigue Evaluation</em> <em>of Existing Steel Bridges</em> (Guide) and the <em>Guide Manual for Condition Evaluation and Load and Resistance Factor Rating (LRFR) of Highway Bridges </em>(Manual) provide guidance on fatigue evaluation of steel bridges. The Guide is more than 17 years old and the material in the Manual is derived from the Guide. Section 7, "Fatigue Evaluation of Steel Bridges" of the<em> Manual for Bridge Evaluation</em>, which is scheduled for publication in 2008, incorporates the material in the Manual. In recent years, more information on steel bridges has been developed that provides a foundation upon which to update the procedures for fatigue evaluation of steel bridges. Some of this information includes: variable-amplitude fatigue behavior; high-cycles and long-life behavior; weigh-in-motion; super-load effects; actual traffic loading; inspection, risk and reliability assessment of bridge details, material properties and structural conditions; and fracture mechanics-based approaches. This information together with extensive experience accumulated in the United States make the development of the new guidance possible.</font></div><div><font size="3">There is an urgent need to update and revise Section 7 of the <em>Manual for Bridge Evaluation</em> to incorporate the findings of research performed in the last 17 years. Areas in need of improvement (unprioritized) include, but are not limited to: (A) Methods of estimating total and remaining fatigue life. The current methods can result in unrealistic and inaccurate predictions. In addition, the load history needed to estimate fatigue life is generally unknown. A reliability based approach is needed to aid bridge owners in making appropriate operational decisions;(B) Guidance on the evaluation of retrofit and repair details used to address fatigue cracks; and (C) guidance for the evaluation of distortion induced fatigue cracks. </font><font size="3">The objective of this project is to revise and update Section 7, "Fatigue Evaluation of Steel Bridges" of the <em>Manual for Bridge Evaluation</em> for consideration by AASHTO. Detailed examples of the application of the provisions shall also be provided.</font></div>


  • English


  • Status: Active
  • Contract Numbers:

    Project 12-81

  • 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:

    Dekelbab, Waseem

  • Performing Organizations:

    Purdue University, West Lafayette

    School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Principal Investigators:

    Bowman, Mark

  • Start Date: 20080423
  • Expected Completion Date: 0
  • Actual Completion Date: 20120131
  • Source Data: RiP Project 16698

Subject/Index Terms

Filing Info

  • Accession Number: 01464605
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 12-81
  • Files: TRB, RiP, USDOT
  • Created Date: Jan 3 2013 2:45PM