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On the response of yielding seismically isolated structures
Author(s) -
Kikuchi Masaru,
Black Cameron J.,
Aiken Ian D.
Publication year - 2007
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.777
Subject(s) - nonlinear system , transient (computer programming) , harmonic , base isolation , superstructure , transient response , ground motion , structural engineering , seismic isolation , frequency response , excitation , simple (philosophy) , simple harmonic motion , response analysis , isolation (microbiology) , control theory (sociology) , physics , engineering , computer science , classical mechanics , acoustics , mechanical engineering , philosophy , electrical engineering , microbiology and biotechnology , epistemology , quantum mechanics , frame (networking) , control (management) , artificial intelligence , biology , operating system
This paper investigates the seismic response of yielding isolated structures. To establish a general understanding of the nonlinear response of seismically isolated structures, this study first investigates the nonlinear response of isolated structures subjected to steady‐state harmonic motion and nonlinear transient ground excitation. The response of both viscously damped and hysteretically damped isolation systems is investigated in three phases. Initially, basic insights are gained through simple nonlinear two degrees of freedom (2‐DOF) models subjected to harmonic motion of varying frequencies. Next, the transient response analysis of the nonlinear 2‐DOF model is investigated for a wide range of isolation system and superstructure properties. The results obtained from both approaches indicate that the yielding behavior of a structure on an isolation system is significantly different from that of the comparable fixed‐base structure. Finally, the response of the nonlinear 2‐DOF system model is compared with that of a 15‐story, three‐dimensional model. Based on the results of these analytical investigations, some important considerations for the design of seismically isolated structures are presented. Copyright © 2007 John Wiley & Sons, Ltd.