Load and Resistance Factor Design (LRFD) and Rating of Structures

Transportation agencies seek a more uniform level of safety and reliability for highway structures. A 1987 Transportation Research Board study concluded that the American Association of State Highway and Transportation Officials’ (AASHTO) Standard Specifications for Highway Bridges contained gaps and inconsistencies and did not use the latest design philosophy and knowledge. In response, AASHTO first adopted the Load and Resistance Factor Design (LRFD) Bridge Design Specification in 1994 and the Guide Manual for Condition Evaluation and Load and Resistance Factor Rating (LRFR) of Highway Bridges in 2002. LRFD incorporates state-of-the-art analysis and design methodologies with load and resistance factors based on the known variability of applied loads and material properties. These load and resistance factors are calibrated from actual bridge statistics to ensure a uniform level of safety.


  • English

Media Info

  • Media Type: Print
  • Pagination: 2p

Subject/Index Terms

Filing Info

  • Accession Number: 01153215
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-HRT-06-052, HRTC-01/01-06(1M)E
  • Files: TRIS, USDOT
  • Created Date: Mar 24 2010 9:36AM