MASH Railing Load Requirements for Bridge Deck Overhang

State highway agencies across the country are upgrading standards, policies, and processes to satisfy the 2016 AASHTO/FHWA Joint Implementation Agreement for the AASHTO Manual for Assessing Safety Hardware (MASH). The AASHTO loading requirements for design of the bridge deck overhang is based on NCHRP Report 350. In order to meet the MASH implementation agreement, the loading requirements and analysis method of bridge deck overhang should be investigated, and the AASHTO LRFD Bridge Design Specifications should be modified accordingly. The research is of urgent need to ensure public safety and satisfy the AASHTO MASH and LRFD bridge design requirements. The objectives of this research are to (1) propose modification to the AASHTO LRFD Bridge Design Specifications related to loading requirements of the AASHTO MASH for bridge deck overhang and (2) develop examples to demonstrate the application of the proposed modifications. At the minimum, the research shall include the analysis and design of bridge deck overhang for concrete, metal, solid and post-beam railings (including curbed and non-curbed) subjected to each of the MASH collision loads.


  • English


  • Status: Active
  • Funding: $440000
  • Contract Numbers:

    Project 12-119

  • 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:

    Abu-Hawash, Ahmad

  • Performing Organizations:

    University of Nebraska, Lincoln

    1400 R Street
    Lincoln, NE  United States  68588
  • Principal Investigators:

    Steelman, Joshua

  • Start Date: 20200817
  • Expected Completion Date: 20230531
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01707722
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 12-119
  • Files: TRB, RIP
  • Created Date: Jun 8 2019 10:12AM