Redundancy in Highway Bridge Superstructures: Phase 2

The product of this study is a proposed methodology for quantifying redundancy in highway bridge superstructures. A proposed specification to account for redundancy in design and evaluation is included. Both the American Association of State Highway and Transportation Officials (AASHTO) Standard Specifications for Highway Bridges and the AASHTO Load and Resistance Factor Design (LRFD) Bridge Design Specifications require consideration of redundancy when designing highway bridges. These specifications provide limited guidance for determining when a structure is, or is not, redundant. The lack of guidance has led to a large variation in the interpretation of the specification. The objective of this study was to develop procedures for quantifying redundancy in highway bridges. A direct calculation method and a simplified method using tabulated "system factors" were developed, and a framework for explicitly including measures of redundancy in design and evaluation was proposed. The complete system factors tables are applicable to steel and prestressed concrete bridges comprised of I-beams or box girders. The introduction of system reliability may prove to be particularly advantageous for evaluating the load capacity of older bridges. The findings of this study are fully documented in National Cooperative Highway Research Program (NCHRP) Report 406: Redundancy in Bridge Superstructures.

Language

  • English

Project

  • Status: Completed
  • Funding: $250000
  • Contract Numbers:

    Project 12-36(2)

  • 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
  • Performing Organizations:

    City University of New York

    205 E 42nd Street
    New York, NY  United States  10017
  • Principal Investigators:

    Ghosn, Michel

    Moses, Fred

  • Start Date: 19940901
  • Expected Completion Date: 0
  • Actual Completion Date: 19970531
  • Source Data: RiP Project 41586

Subject/Index Terms

Filing Info

  • Accession Number: 01634570
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 12-36(2)
  • Files: TRB, RiP
  • Created Date: May 5 2017 1:00AM