Research for AASHTO Standing Committee on Highways. Task 390. Parametric Study & Cost Effects for the USDOT Truck Size & Weight Study Vehicles

In the recently completed U.S. Department of Transportation (USDOT) Study, Review of U.S. Department of Transportation Truck Size and Weight Study (USDOT TS&W Study), a small number of bridges in relation to the total population of bridges were evaluated for force effects and the associated cost to strengthen or replace them due to the increased weight of the new legal truck configurations and gross weights. A broader study of the force effects, such as increased demand on girders and deck, reduction in service life, and remaining fatigue life, on the total population of bridges in the United States would be beneficial to understand and predict more accurate cost effects of increasing legal loads. More generally, the Highway Subcommittee on Bridges and Structures needs a roadmap that acknowledges ongoing and complete truck-size-weight-cost studies related to bridge condition and provides the logical next steps. At the minimum, the parametric study should compare the force effects (moments and shears) of standard AASHTO bridge design trucks (HS-20, HS-15, H-20, H-15 and HL-93) over a full range of span lengths (20’ to 250’) for both simply supported and continuous structures to the six trucks evaluated in the USDOT TS&W study. The objectives of this research were to (1) conduct a parametric study to assess the impact of increasing legal loads on highway bridges, including local and currently posted bridges, on the cost of bridge replacement per state; (2) prepare a roadmap of study items and actions necessary to make the true cost effects of increasing legal loads known by decision makers.


  • English


  • Status: Completed
  • Funding: $75000
  • Contract Numbers:

    Project 20-07, Task 390

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

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

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Dekelbab, Waseem

  • Performing Organizations:

    AECOM Technical Services, Inc.

    Minneapolis,   United States 
  • Principal Investigators:

    Wassef, Wagdy

  • Start Date: 20160719
  • Expected Completion Date: 0
  • Actual Completion Date: 20170719
  • Source Data: RiP Project 40795

Subject/Index Terms

Filing Info

  • Accession Number: 01598909
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-07, Task 390
  • Files: TRB, RiP
  • Created Date: May 8 2016 1:00AM