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Earthquakes and Structures
  Volume 4, Number 4, April 2013 , pages 397-428

The engineering merit of the \"Effective Period\" of bilinear isolation systems
Nicos Makris and Georgios Kampas

    This paper examines whether the \"effective period\" of bilinear isolation systems, as defined invariably in most current design codes, expresses in reality the period of vibration that appears in the horizontal axis of the design response spectrum. Starting with the free vibration response, the study proceeds with a comprehensive parametric analysis of the forced vibration response of a wide collection of bilinear isolation systems subjected to pulse and seismic excitations. The study employs Fourier and Wavelet analysis together with a powerful time domain identification method for linear systems known as the Prediction Error Method. When the response history of the bilinear system exhibits a coherent oscillatory trace with a narrow frequency band as in the case of free vibration or forced vibration response from most pulselike excitations, the paper shows that the
Key Words
    seismic isolation; equivalent linearization; bilinear behavior; system identification; health monitoring; earthquake protection
Nicos Makris: Division of Structures, Department of Civil Engineering, University of Patras, Greece; Georgios Kampas: Robertou Galli 27, Athens 11742, Greece

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