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Payam Ashtari

S.H. Ghasemi and P. Ashtari
Combinatorial continuous non-stationary critical excitation in M.D.O.Fstructuresusing multi-peakenvelope functions
Abstract


In the critical excitation method, the main objective is to generate the strongest possible response in the structure considering random nature of earthquake subject to the appropriate constraints such as earthquake power and intensity.Indeed, the majority of previous critical excitation methods were only a theoretical solution of optimization problem which reveal a discontinuous power spectral density (PSD) in their frequency range. This paper will provide critical excitation,having appropriative continuity in their frequency domain using linear combination of two continuous functions.In order to provide a nonstationary model of earthquake, this research also attempts to present suitable envelope function that, unlike previous envelope functions, covers natural earthquake accelerograms in different peaks. Finally, the proposed method is illustrated in M.D.O.F structures and is compared with the other methods. KEY WORDS: Random Vibrations, Continuous Critical Excitation, Envelope function, Power Spectral Density.

 

 

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