An intelligent semi-active isolation system based on ground motion characteristic prediction

Tzu-Kang Lin, Lyan Ywan Lu*, Chia En Hsiao, Dong You Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This study proposes an intelligent semi-active isolation system combining a variable-stiffness control device and ground motion characteristic prediction. To determine the optimal control parameter in real-time, a genetic algorithm (GA)-fuzzy control law was developed in this study. Data on various types of ground motions were collected, and the ground motion characteristics were quantified to derive a near-fault (NF) characteristic ratio by employing an on-site earthquake early warning system. On the basis of the peak ground acceleration (PGA) and the derived NF ratio, a fuzzy inference system (FIS) was developed. The control parameters were optimized using a GA. To support continuity under near-fault and far-field ground motions, the optimal control parameter was linked with the predicted PGA and NF ratio through the FIS. The GA-fuzzy law was then compared with other control laws to verify its effectiveness. The results revealed that the GA-fuzzy control law could reliably predict different ground motion characteristics for real-time control because of the high sensitivity of its control parameter to the ground motion characteristics. Even under near-fault and far-field ground motions, the GA-fuzzy control law outperformed the FPEEA control law in terms of controlling the isolation layer displacement and the superstructure acceleration

Original languageEnglish
Pages (from-to)53-64
Number of pages12
JournalEarthquake and Structures
Volume22
Issue number1
DOIs
StatePublished - Jan 2022

Keywords

  • Fuzzy inference system
  • Genetic algorithm
  • Ground motion characteristic
  • Seismic isolation
  • Semi-active control
  • Stiffness-variable

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