Design of a self centering seismic base isolator for an antiquity

A. N. Stavridis*, M. J. Schoettler, P. G. Somerville, H. K. Thio, J. C. Podany

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

2 Citations (Scopus)


A study of a base isolator implemented to reduce the risk of seismic damage to an ancient Greek Panathenaic Amphora in the collections of the J. Paul Getty Villa Museum is presented. The museum is located in Malibu, California. The seismicity of the area was assessed through a complete Probabilistic Seismic Hazard Analysis that resulted in hazard spectra for a return period of 475 years and a suite of seven, site suitable ground motions. The isolator consists of three metal frames and two sets of compression springs. The metal frames slide on the two interfaces between them implementing the concept of base isolation. The relative displacement of the frames is resisted by compression springs which provide the restoring force. The design incorporated geometric restrictions due to aesthetic concerns, and addressed the structural properties by treating the isolator as a Single Degree of Freedom structure. The achieved period and actual damping coefficient were verified with in situ free vibration tests, used to assess and optimize the design. For the final design, the selected ground motions, appropriately scaled, were used to obtain sets of springs that reduce the seismic response in terms of force and displacement demand.

Original languageEnglish
Title of host publication8th US National Conference on Earthquake Engineering 2006
Place of PublicationOakland
PublisherEarthquake Engineering Research Institute (EERI)
Number of pages10
ISBN (Print)9781615670444
Publication statusPublished - 2006
Externally publishedYes
Event8th US National Conference on Earthquake Engineering 2006 - San Francisco, CA, United States
Duration: 18 Apr 200622 Apr 2006


Other8th US National Conference on Earthquake Engineering 2006
Country/TerritoryUnited States
CitySan Francisco, CA


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