Vertical stiffness of elastomeric and lead-rubber seismic isolation bearings

Gordon Patrick Warn, Andrew S. Whittaker, Michael C. Constantinou

Research output: Contribution to journalArticlepeer-review

133 Scopus citations


An experimental study investigating the influence of lateral displacement on the vertical stiffness of elastomeric and lead-rubber seismic isolation bearings is summarized. Two identically constructed low-damping rubber and lead-rubber seismic isolation bearings were subjected to a series of tests with varying levels of combined lateral displacement and axial (compressive) loading to study this relationship. The results of these tests showed the vertical stiffness decreases with increasing lateral displacement for each bearing tested. Additionally, the vertical stiffness data are used to evaluate four formulations for the estimation of the vertical stiffness as a function of the lateral displacement. From this comparison, two formulations, one based on the Koh-Kelly two-spring model and the other on a piecewise linear relationship, showed good agreement with the experimental data over the wide range of lateral displacements considered in this study.

Original languageEnglish (US)
Pages (from-to)1227-1236
Number of pages10
JournalJournal of Structural Engineering
Issue number9
StatePublished - Aug 27 2007

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


Dive into the research topics of 'Vertical stiffness of elastomeric and lead-rubber seismic isolation bearings'. Together they form a unique fingerprint.

Cite this