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Earthquakes and Structures Volume 4, Number 4, April 2013 , pages 397-428 DOI: https://doi.org/10.12989/eas.2013.4.4.397 |
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The engineering merit of the \"Effective Period\" of bilinear isolation systems |
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Nicos Makris and Georgios Kampas
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| Abstract | ||
| 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 | ||
| Address | ||
| Nicos Makris: Division of Structures, Department of Civil Engineering, University of Patras, Greece; Georgios Kampas: Robertou Galli 27, Athens 11742, Greece | ||