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Structural Engineering and Mechanics
  Volume 31, Number 5, March 30 2009 , pages 527-544

Periodic seismic performance evaluation of highway bridges using structural health monitoring system
Jin-Hak Yi, Dookie Kim and Maria Q. Feng

    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.
Key Words
    seismic performance evaluation; seismic fragility curve; model updating; genetic algorithm; output-only modal identification.
Jin-Hak Yi: Coastal Engineering and Ocean Energy Research Department, Korea Ocean Research and Development Institute, Gyeonggi 426-744, Korea
Dookie Kim: Department of Civil and Environmental Engineering, Kunsan National University, Jeonbuk, Korea
Maria Q. Feng: Department of Civil and Environmental Engineering, University of California, Irvine, CA92744, USA

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