Seismic Performance Assessment of Quasi-Isolated Highway Bridges with Seat-Type Abutments

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In recent years, Illinois bridge engineers developed an innovative “quasi-isolation” seismic bridge design methodology. The objectives of this study are to assess the seismic performance of prototype quasi-isolated highway bridges, to validate the design strategy, and to provide recommendations for improving bridge seismic performance. A matrix of bridges was computationally studied. Seismic assessment results validate that the current quasi-isolation design strategy is generally effective in preventing global collapse, but the response of a small number of bridges demonstrated a relatively high risk of bearing unseating and severe pier damage. Recommendations for calibrating the current design strategy have therefore been proposed.

Original languageEnglish (US)
Pages (from-to)2285-2324
Number of pages40
JournalJournal of Earthquake Engineering
Issue number11
StatePublished - 2021


  • Base isolation highway bridge response
  • history analysis bearing unseating seismic damage

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality


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