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Some Observations on the Random Response of Hysteretic Systems.
Paparizos, L. G.
National Science Foundation, Washington, DC. Directorate for Engineering., cJanuary 1986, 197 p.
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The thesis concerns the nature of hysteretic response behavior of structures subjected to strong seismic excitation. The earthquake ground motion is modeled as a stochastic process and the dependence of the response on system and excitation parameters is examined. Consideration is given to the drift of structural systems and its dependence on the low frequency content of the earthquake spectrum. A stochastic model obtained by filtering a modulated white noise signal through a second order linear filter is used. A new approach is followed in the analysis of the elasto-plastic system. The problem is formulated in terms of the drift, defined as the sum of yield increments associated with inelastic response. Results indicate that the drift response statistics are strongly dependent on the normalized characteristic frequency and strength of the excitation, while a weaker dependence on the bandwidth of excitation is noted.
; Elastic aftereffect; Plastic analysis; Earthquake engineering; Hysteresis; Random processes; Markov processes; Mathematical models; Seismic prospecting