Physical system identification of an isolated bridge using seismic response data

Ming Chih Huang, Yen-Po Wang, Jer Rong Chang, Chia Shang Chang Chien

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


This paper develops a system identification process based on seismic response data to investigate the physical parameters of an isolated highway bridge equipped with the lead-rubber bearings (LRBs). The effects of soil-structure interaction (SSI) of the highway bridge built on pile foundations are taken into account in the analysis. Unlike many other identification methods that generally seek for the equivalent system parameters or modal parameters of the target structure, the proposed method aims at identifying physical parameters such as the pier stiffness or hysteresis of the LRB that are considered more critical and useful for health monitoring of bridges. In this study, a linear elastic model is used for the pier while a bilinear model is considered to characterize the hysteretic behavior of the LRB. The bilinear hysteretic model is in turn reduced to a backbone curve based on the Masing criterion by which the multi-valued restoring force is transformed into a single-valued function so that the computational effort of the identification process can be minimized. Numerical examples have been conducted, including the identification of Bai-Ho Bridge, which is the first seismic isolation bridge in Taiwan, to demonstrate the feasibility of the proposed technique for dynamic systems with inelastic components and SSI.

Original languageEnglish
Pages (from-to)241-265
Number of pages25
JournalStructural Control and Health Monitoring
Issue number2
StatePublished - 1 Mar 2009


  • Hysteresis
  • Isolated bridge
  • Lead-rubber bearings
  • Physical identification
  • Soil-structure interaction

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