Optimal semiactive control of structures with isolated base

U. Aldemir*, H. P. Gavin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The paper investigates the benefits of implementing the semiactive control systems in relation to passive viscous damping in the context of seismically isolated structures. Frequency response functions are compiled from the computed time history response to pulse-like seismic excitation. A simple semiactive control policy is evaluated in regard to passive linear viscous damping and an optimal non-causal semiactive control strategy. The optimal control strategy minimizes the integral of the squared absolute accelerations subject to the constraint that the nonlinear equations of motion are satisfied. The optimization procedure involves a numerical solution to the Euler-Lagrange equations.

Original languageEnglish
Pages (from-to)235-240
Number of pages6
JournalInternational Applied Mechanics
Issue number2
Publication statusPublished - Feb 2006


Acknowledgments. The authors gratefully acknowledge supports for this work from the USA-National Science Foundation under grant CMS-9900193, the Scientific and Technical Research Council of Turkey (NATO-B1 Research Scholarship), Technical University of Istanbul Research Fund under grant 707 and Tincel Cultur Foundation of Istanbul University.

FundersFunder number
Technical University of Istanbul Research Fund707
Tincel Cultur Foundation of Istanbul University
USA-National Science FoundationCMS-9900193
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu


    • Euler-Lagrange equations
    • Nonlinear systems
    • Optimal control


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