Evaluation of Seismic Strengthening of an Existing Building Using Base Isolation

by Gary C. Hart, Univ of California, Los Angeles, CA, USA,
Ali Basharkhah, Univ of California, Los Angeles, CA, USA,
Sunil Gupta, Univ of California, Los Angeles, CA, USA,

Abstract: This paper summarizes a study performed by Englekirk and Hart, Inc. to evaluate the feasibility of using base isolation to seismically upgrade an existing highrise building. To realize the study objectives, the authors determined the desired characteristics of the base isolation system required for the building; developed mathematical models for both a conventional and a base isolated structure; performed linear structural dynamic analyses of both mathematical models using the design earthquake response spectra; calculated the values of the building's displacements, accelerations, forces and moments using the mathematical models; developed the design of a base isolation scheme; redesigned representative structural elements for seismic forces of the base isolated system; and developed a structural, seismic, upgrade construction cost comparison between a conventional structural system upgrade and a base isolated system upgrade.

Subject Headings: Base isolation | Building design | Seismic tests | Model analysis | Structural analysis | Structural systems | Existing buildings

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