Probabilistic seismic demand models and fragility estimates for reinforced concrete bridges with base isolation

Paolo Gardoni Prof., David Trejo

Research output: Contribution to journalArticlepeer-review

Abstract

This paper proposes probabilistic models for estimating the seismic demands on reinforced concrete (RC) bridges with base isolation. The models consider the shear and deformation demands on the bridge columns and the deformation demand on the isolation devices. An experimental design is used to generate a population of bridges based on the AASHTO LRFD Bridge Design Specifications (AASHTO 2007) and the Caltrans' Seismic Design Criteria (Caltrans 1999). Ground motion records are used for time history analysis of each bridge to develop probabilistic models that are practical and are able to account for the uncertainties and biases in the current, common deterministic model. As application of the developed probabilistic models, a simple method is provided to determine the fragility of bridges. This work facilitates the reliability-based design for this type of bridges and contributes to the transition from limit state design to performance-based design.

Original languageEnglish (US)
Pages (from-to)429-449
Number of pages21
JournalEarthquake and Structures
Volume4
Issue number4
DOIs
StatePublished - Apr 1 2013

Keywords

  • Base isolation
  • Experimental design
  • Finite element
  • Highway bridge
  • Importance analysis
  • Probabilistic model
  • Seismic demand
  • Seismic fragility

ASJC Scopus subject areas

  • Civil and Structural Engineering

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