Causal semiactive control of seismic response

U. Aldemir*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


A challenge in the use of semiactive dampers for the earthquake response reduction is the development of implementable control algorithms. Exact optimal control resulting from the numerical solution to Euler-Lagrange equations requires a priori knowledge of earthquake in the control interval, which is not possible. This paper proposes a causal sub-optimal implementable control to reduce the earthquake response using an inherently nonlinear controllable fluid damper. The proposed method is basically based on the prediction of the near-future ground accelerations using maximum-entropy method. The earthquake response of low-rise, two degree of freedom (dof) base isolated structure is investigated for the proposed causal sub-optimal control and the resulting performance is compared to the exact optimal control and the uncontrolled case. The results show that the proposed control is promising in protecting the earthquake-excited buildings.

Original languageEnglish
Pages (from-to)665-673
Number of pages9
JournalJournal of Sound and Vibration
Issue number4-5
Publication statusPublished - 22 May 2009


The author gratefully acknowledges the support from the European Commission for “ FP6 , LessLoss-Risk Mitigation for Earthquakes and Landslides ” ( , Contract no: GOCE-CT-2003-505448) and thanks M. Ozdilim for his help in evaluating the simulations.

FundersFunder number
European CommissionGOCE-CT-2003-505448


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