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This paper presents a technique for identification of non-linear hystereticsystems subjected to non-stationary loading. In the numerical simulations, aBouc-Wen model was chosen for its ability to represent the properties of a wideclass of real hysteretic systems. The parameters of the model are computedinstantaneously by approximating the internal restoring force surface throughan "ad hoc" polynomial basis. Instantaneous estimates result from time-varyingspectra of the response signals. A numerical application of interest toearthquake engineering is finally reported.

Instantaneous identification of Bouc-Wen-type hysteretic systems from seismic response data