Research for AASHTO Standing Committee on Highways. Task 348. Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for future updates

Of the nearly 600,000 bridges listed in the Federal Highway Administration's (FHWA) National Bridge Inventory, close to 1,000 bridges are movable bridges. The design and installation of structural, mechanical and electrical components provide significant challenges for designers, contractors and owners in any movable bridge project. The primary design guide for movable bridge design and construction is the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Movable Highway Bridge Design Specifications. This Manual was first published in 2000 with 2002 Interim Revisions. The second edition of the Manual was published in 2007, with yearly Interim Revisions from 2008 to 2012. Based on the input from movable bridge owners, designers and industry representatives, the current specifications need further updating to incorporate the LRFD method, which follows a reliability-based design methodology and to reflect advances in electrical drives and controls, mechanical systems, and traffic/marine safety systems. The objectives of this research are to do the following: (1) Develop a stand-alone synthesis of the various types of electrical controls and drives, and mechanical systems currently being used in movable bridges; (2) Identify the areas of the AASHTO LRFD Movable Bridge Design Specifications that require modification or addition to incorporate the LRFD method and to reflect the advances in structural materials and design, electrical drives and controls, mechanical systems, and traffic/marine safety systems; and (3) Propose recommendations for future research needs. Accomplishment of the project objectives will require at least the following tasks: Task 1. Review relevant literature, specifications and manuals, ongoing research, current practices, federal safety standards, and other information canvassing all engineering disciplines (i.e., structural component design, mechanical and electrical systems, operations, and traffic/marine safety systems) to determine the current state-of-knowledge. This information shall be assembled from published and unpublished reports, bridge owners, and others. Task 2. Synthesize the available information related to the various types of (1) electrical drives and controls and (2) mechanical systems (e.g., open gearing, enclosed gearing, hydraulics, etc) for movable bridges. Identify the pros and cons of various systems and components. Submit the synthesis report for panel review. Task 3. Discuss the application of reliability-based design methodology to design the mechanical and electrical systems, and traffic/marine safety systems for movable bridges, and identify the pros and cons of any suggested modifications. Task 4. Prepare a detailed outline identifying the proposed areas of the AASHTO LRFD Movable Bridge Design Specifications that will require modification or addition with the possibility of reordering of the existing sections and appendices based on the findings from Tasks 1 through 3. Task 5. Revise the proposed outline according to the NCHRP project panel comments.Task 6. Make a presentation to the AASHTO HSCOBS Technical Committee T-8 Movable Bridges. Revise the proposed outline if it's needed. Task 7. Develop a research problem statement to update the AASHTO LRFD Movable Bridge Design Specifications according to the proposed outline developed under Task 4. Task 8. Submit a final report describing the entire research effort with the synthesis report. Following receipt of the draft final report, the remaining 2 months shall be for NCHRP review and comment and for research agency preparation of the revised final report.


  • English


  • Status: Completed
  • Funding: $100000.00
  • Contract Numbers:

    Project 20-07, Task

  • Sponsor Organizations:

    National Cooperative Highway Research Program

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

    Dekelbab, Waseem

  • Performing Organizations:

    Parsons Brinckerhoff

    2545 Farmers Dr. Suite 350
    Columbus, OH  United States  43235
  • Principal Investigators:

    Abrahams, Michael

  • Start Date: 20140114
  • Expected Completion Date: 0
  • Actual Completion Date: 20150531
  • Source Data: RiP Project 38191

Subject/Index Terms

Filing Info

  • Accession Number: 01547406
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-07, Task
  • Files: TRB, RiP
  • Created Date: Dec 9 2014 1:01AM