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System Identification of Base-isolated Buildings Utilizing Records from Recent Southern California Earthquakes

Halling, Marvin W. and Hall, John F. and Okahashi, Yasuteru (1996) System Identification of Base-isolated Buildings Utilizing Records from Recent Southern California Earthquakes. In: Eleventh World Conference on Earthquake Engineering. Elsevier , Paper No. 1342. ISBN 0080428223.

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System identification is used in this study as a systematic approach to determine modal periods, mode shapes, and estimated damping for three Southern California base-isolated buildings. In addition, estimates of the level of response each building experienced during recent earthquakes can be evaluated. Of particular interest are the variations in modal parameters as a function of the level of excitation due to the non-linear nature of these structures. By using identification of each building for several earthquakes and dividing the time histories into short segments, structural response trends can be investigated. It is shown that structural period and damping vary with amplitude of excitation. Since the bearings are hysteretic and softening elements, under increased structural response, the periods of vibration as well as the equivalent modal viscous damping increase. It is also shown that although the 1994 Northridge California earthquake generated moderate levels of horizontal ground acceleration at building sites, the bearings were exercised well below their maximum design levels.

Item Type:Book Section
Hall, John F.0000-0002-7863-5060
Additional Information:Copyright© 1996 Elsevier Science, Ltd. The authors acknowledge the funding provided by the Utah Mineral Lease Funds.
Funding AgencyGrant Number
Utah Mineral Lease FundsUNSPECIFIED
Subject Keywords:system identification; seismic isolation; base isolation; Northridge earthquake; Landers earthquake; modal periods; mode shapes; modal damping
Record Number:CaltechAUTHORS:20121022-105845475
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35003
Deposited On:23 Oct 2012 21:47
Last Modified:09 Mar 2020 13:18

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