Abstract
Abstract. The influence of non-Gaussian modeling of the wind action on the response of MDOF structures is considered. Assuming the turbulence as a homogeneous Gaussian field, the wind action field is described by means of the correlation and bicorrelation functions. Once known the spectrum and the bispectrum (by Fourier transform), the same quantities of the structural response are obtained by frequency domain analysis. This allows to evaluate the statistic moments of the response until the third moment and to estimate the peak value distribution. The procedure is applied to analyze a broadcasting antenna. Varying the structural damping and the wind characteristics, a comparison between Gaussian and non-Gaussian modeling is performed.
Sommario. Viene studiata l'influenza della modellazione non-Gaussiana dell'azione del vento sulla risposta di strutture a più gradi di libertà. Considerando la turbolenza come un campo Gaussiano omogeneo, l'azione del vento viene descritta mediante le funzioni correlazione e bicorrelazione. Determinato poi lo spettro ed il bispettro (mediante trasformata di Fourier), le stesse grandezze relative alla risposta strutturale sono ricavate per mezzo dell'analisi nel dominio delle frequenze. È così possibile valutare i momenti statistici della risposta fino al terzo ordine e stimare la distribuzione dei valori di picco. La procedura viene applicata all'analisi della risposta di un'antenna per telecomunicazioni. Variando lo smorzamento strutturale e le caratteristiche del vento, vengono paragonate fra loro la modellazione Gaussiana e quella non-Gaussiana.
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Gusella, V., Materazzi, A.L. Non-Gaussian Response of MDOF Wind-Exposed Structures: Analysis by Bicorrelation Function and Bispectrum. Meccanica 33, 299–307 (1998). https://doi.org/10.1023/A:1004355317308
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DOI: https://doi.org/10.1023/A:1004355317308