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Response spectral characteristics and reliabilities of linear structures to both intensity and frequency content time-varying earthquake loads in Journal of structural engineering, Vol. 138 N° 12 (Décembre 2012)
Response spectral characteristics and reliabilities of linear structures to both intensity and frequency content time-varying earthquake loads [texte imprimé] / Jun He, Auteur . - 2013 . - pp. 1492–1504.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 138 N° 12 (Décembre 2012) . - pp. 1492–1504
Mots-clés : Random earthquake load Yeh-Wen model Linear elastic structure Spectral characteristics First-passage probability Résumé : A numerical method for estimating the useful spectral characteristics of responses of classically damped linear elastic structures to the Yeh-Wen model of fully nonstationary random earthquake loads is developed. The derivation of the method is carried out in three steps. First, the stationary Gaussian white noise process in the space of a frequency modulation function is transformed to the uniformly modulated Gaussian white noise process in the time space. Second, the numerical computation procedure for the unit impulse response functions in the time domain of the Clough-Penzien filters modified in the space of a frequency modulation function is proposed. Finally, the numerical solutions for the useful spectral characteristics of responses of linear structures to the Yeh-Wen model are given, from which the first-passage reliability problem can be solved by using Vanmarcke’s approximation. Numerical investigation of a simple oscillator shows the effect of the frequency modulation functions on the numerical results and computational efficiency of the developed method. The numerical analysis of the spectral characteristics and first-passage probabilities of a response of a supertall television tower demonstrates how to implement the numerical method in practical applications. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000600
