Modal identification of seismically isolated bridges with piers having different heights
by Georgios Kampas; Nicos Makris
International Journal of Sustainable Materials and Structural Systems (IJSMSS), Vol. 2, No. 1/2, 2015

Abstract: This paper investigates the modal identification of seismically isolated bridges when the localised nonlinear behaviour from the isolation bearing initiates at different times due to the uneven height of the bridge piers. More specifically, a three-span bridge supported on spherical sliding bearings is examined. Three different states of the same system with different natural periods emerge during an excitation; the linear system (LS), the partially isolated system (PIS) and the fully isolated system (FIS). Firstly, the paper identifies the time intervals that each state performs by using acceleration data. Subsequently, modal identification techniques such as the prediction error method and a time-frequency wavelet analysis are applied on each interval. The LS results are dependable compared to the PIS which is a mildly nonlinear system. The results corresponding to the FIS suggest that it is preferable to apply the modal identification techniques on each interval independently, rather than on the entire response signal.

Online publication date: Mon, 15-Aug-2016

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