Hybrid Time/Frequency Domain Identification of Real Base-Isolated Structure
Paper i proceeding, 2016

This paper presents a case study using hybrid time-and frequency-domain identifications in a synergistic manner to develop models of a full-scale experimental base-isolated structure. This four-story reinforced-concrete building on an isolation layer (of rubber bearings, elastic sliding bearings, passive metallic yielding dampers, and controllable oil dampers) was designed and constructed at the large-scale Japanese NIED E-Defense earthquake engineering laboratory. A variety of sensors, including accelerometers, were mounted within the structure to measure building response to shake table excitations. While the building was ultimately subjected to historical and synthetic ground motions, the recorded table and building accelerations during a number of random excitation tests are used to identify the structure's natural frequencies, damping ratios and mode shapes. The substantial damping provided by the isolation layer necessitates adopting a hybrid time-and frequency-domain approach for identification. The modes of the structure are separated by frequency content wherein lower frequency modes are identified using time domain approaches from the subspace identification family of methods and higher frequency modes are identified using frequency response functions. Individually, neither approach is able to successfully identify all of the desired modes but, through their combination, the modal properties of the structure are successfully characterized.

State-space models


Full-scale testing

Frequency response functions

Modal analysis


[Person aa2c8d1a-0e6a-4a69-a19c-67a57a10e040 not found]

University of Southern California

[Person 98c14989-996c-4d21-9ab3-fa554f7aa57e not found]

University of Southern California

[Person 2d622f86-7668-4229-8487-3565942b52dc not found]

University of Southern California

[Person 7755d341-19bd-4125-888a-0f3191b0d0fe not found]


[Person 4c32ceb9-f127-43ea-bdef-eeb65b1fd681 not found]

National Research Institute for Earth Science and Disaster Prevention (NIED)

[Person ded40129-1352-40b1-8c24-0df669ccf7cc not found]

National Research Institute for Earth Science and Disaster Prevention (NIED)

Dynamics of Civil Structures : Proceedings of the 34th IMAC, A Conference and Exposition on Structural Dynamics 2016

2191-5652 (eISSN)

Vol. 2 303-311







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