Structural Engineering and Mechanics

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Periodic seismic performance evaluation of highway bridges using structural health monitoring system

  • Yi, Jin-Hak (Coastal Engineering and Ocean Energy Research Department, Korea Ocean Research and Development Institute) ;
  • Kim, Dookie (Department of Civil and Environmental Engineering, Kunsan National University) ;
  • Feng, Maria Q. (Department of Civil and Environmental Engineering, University of California)
  • Received : 2008.08.18
  • Accepted : 2009.02.23
  • Published : 2009.03.30
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Abstract

In this study, the periodic seismic performance evaluation scheme is proposed using a structural health monitoring system in terms of seismic fragility. An instrumented highway bridge is used to demonstrate the evaluation procedure involving (1) measuring ambient vibration of a bridge under general vehicle loadings, (2) identifying modal parameters from the measured acceleration data by applying output-only modal identification method, (3) updating a preliminary finite element model (obtained from structural design drawings) with the identified modal parameters using real-coded genetic algorithm, (4) analyzing nonlinear response time histories of the structure under earthquake excitations, and finally (5) developing fragility curves represented by a log-normal distribution function using maximum likelihood estimation. It is found that the seismic fragility of a highway bridge can be updated using extracted modal parameters and can also be monitored further by utilizing the instrumented structural health monitoring system.

Keywords

Acknowledgement

Supported by : Korea Science and Engineering Foundation (KOSEF)

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