Update of the AASHTO LRFD Movable Highway Bridge Design Specifications

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 2014. Based on the input from movable bridge owners, designers, and industry representatives, there is a desire to further update the current specifications to develop and implement a reliability-based design methodology and to reflect advances in electrical drives and controls, mechanical systems, and traffic/marine safety systems. Toward this goal, National Cooperative Highway Research Program (NCHRP) Project 20-07/Task 348, “Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates,” was previously funded and a synthesis report prepared. The proposed title would no longer include the term “LRFD” (load and resistance factor design) and because, for movable machinery, power, and controls, the proposed specifications will adopt a reliability-based approach, which is consistent with how mechanical and electrical systems are designed. The research objectives are: (1) Propose revisions to the Specifications. The revisions should be prepared recognizing the latest developments in movable bridge design and rehabilitation. Additionally, the proposed revisions should be consistent with adopted AASHTO specifications and manuals. (2) Propose recommendations for future research needs.

• Record URL:
  http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4193
• Supplemental Notes:
  • Source of proposed project: AASHTO Highway Subcommittee on Bridges and Structures. Contract to a Performing Organization has not yet been awarded.

Language

• English

Project

• Status: Proposed
• Funding: $500000
• Contract Numbers:

  Project 12-112

• 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 Aviation Administration

  800 Independence Avenue, SW
  Washington, DC  United States  20591
• Project Managers:

  Dekelbab, Waseem

• Start Date: 20160511
• Expected Completion Date: 0
• Actual Completion Date: 0
• Source Data: RiP Project 40827

Subject/Index Terms

• TRT Terms: Bridge design; Design methods; Load and resistance factor design; Movable bridges; Specifications
• Identifier Terms: American Association of State Highway and Transportation Officials
• Subject Areas: Bridges and other structures; Design; Highways;

Filing Info

• Accession Number: 01598974
• Record Type: Research project
• Source Agency: Transportation Research Board
• Contract Numbers: Project 12-112
• Files: TRB, RiP
• Created Date: May 11 2016 1:00AM