Response of Base-Isolated Structures in Recent Californian Earthquakes

by J. Kelly, I. Aiken and P. Clark

Kelly, J., I. Aiken and P. Clark (1991). Response of Base-Isolated Structures in Recent Californian Earthquakes. SMIP91 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 12-1 - 12-10.

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The October 1989 Loma Prieta and February 1990 Upland earthquakes both affected base-isolated structures and provided the first significant earthquake response data from base-isolated structures in the U.S. In the Loma Prieta earthquake, California Strong Motion Instrumentation Program (CSMIP) sensors on the Sierra Point Overhead were triggered, and in the Upland earthquake, the Foothill Communities Law and Justice Center (FCLJC) in Rancho Cucamonga experienced significant ground accelerations, CSMIP instruments again recording the motions.

The responses of the two structures are investigated in a study of the strong-motion data. Isolation system characteristics are determined from the data and these are used in analytical studies of the structure responses. Implications of the results on current design approaches and code requirements for base-isolated structures are addressed.