Seismic Retrofit Assessment with Multilevel Performance Objectives

Performance-based approaches are gaining popularity for design of new and retrofitted bridges in earthquake-prone regions, and the recent edition of the Seismic Retrofitting Manual for Highway Bridges has outlined a dual-level performance evaluation for bridge retrofit. Seismic fragility curves, which state the probability for meeting or exceeding a damage state for a given realization of ground motion intensity, offer a unique opportunity for initial screening of potential retrofit measures under imposed performance requirements. The development of system level fragility curves permits an assessment of the impact of retrofit on the overall bridge vulnerability. These retrofitted bridge fragility curves are presented for a class of multi-span simply supported steel girder bridges and used in a framework developed for retrofit evaluation under multi-level performance objectives, such as those stated in the Retrofit Manual. This framework uses fragility curves to assess which retrofit strategies are most effective in achieving stated performance objectives, in terms of the acceptable level of post-event damage and bridge functionality, as well as the design level earthquake event. The framework can be used to support retrofit assessment and decision-making for meeting minimum recommended performance levels or enhanced user specified performance objectives.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 13p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01046027
  • Record Type: Publication
  • Report/Paper Numbers: 07-1405
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 6:00PM