Seismic performance of guideway sliding isolator with gap springs for precision machinery

George C. Yao, Wen Chun Huang, Fan Ru Lin

Research output: Contribution to journalArticlepeer-review


The performance of gap springs in a guideway sliding isolator (GSI) system developed to protect precision machinery against seismic motion has been studied. A spring is initially distanced from the system by a gap, causing the isolation system to exhibit nonlinear performance once the gap is closed, reducing the chance of resonance. A full-scale shaking table test of a 22-ton specimen and a numerical model simulation in SAP2000 have been performed. The study shows that springs possessing the appropriate gaps are more effective in controlling relative displacements than is a pure friction system. The optimal gap for a system subjected to far-field earthquakes was found to be 5mm. In addition, supplemental viscous damping of less than 15% of the critical damping had no significant effect on the GSI system far-field seismic response, but it did reduce the relative displacements of the system for near-fault seismic excitations.

Original languageEnglish
Pages (from-to)511-524
Number of pages14
JournalAdvances in Structural Engineering
Issue number5
Publication statusPublished - 2008 Oct 1

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction

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