Towards Next Generation LRFD Extreme Event Design Limit States

The American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Specification for bridges has its strength design limit state formulated and fully calibrated using the reliability-based approach. The extreme event design limit states, however, are constructed by combining the non-extreme load effects with the independently established extreme hazard load effects through professional judgment. Its margin of safety and adequacy could not be assessed quantitatively. A research project sponsored by the Federal Highway Administration (FHWA) has been carried out to explore principles and approaches for establishing multiple-hazard (MH)-LRFD based on the established rationale and reliability-based methodology of the AASHTO LRFD. An analytical framework has been established to consider the non-extreme and extreme loads on a common reliability-based platform. This paper will describe the formulation of specific extreme event design limit state (e.g. the limit state for non-extreme load with the earthquake load effects) by using the all-hazard, reliability-based approach. Future challenges towards the development of a comprehensive MH-LRFD will be described.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 463-472
  • Monograph Title: Structures Congress 2014

Subject/Index Terms

Filing Info

  • Accession Number: 01522429
  • Record Type: Publication
  • ISBN: 9780784413357
  • Files: TRIS, ASCE
  • Created Date: Apr 9 2014 3:01PM