AASHTO SEISMIC ISOLATION DESIGN REQUIREMENTS FOR HIGHWAY BRIDGES

This is a review of the basic principles of seismic isolation, and a summary of AASHTO's guide specifications for seismic isolation bridge design. The paper also provides a methodology for comparing different isolation systems. It is noted that although seismic isolation offers significant benefits, it is by no means a panacea. Feasibility studies are required early in the design phase, and if seismic isolation is appropriate from a technical and first-cost perspective, then significant life cycle cost advantages can be achieved. In the case of bridges, reductions in earthquake loads can be significant and savings can be achieved in the foundations of new designs as well as improved seismic performance (elastic response). Seismic isolation code requirements are discussed which are a key step in the implementation of the technology.

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  • Accession Number: 00621120
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Apr 30 1992 12:00AM