The increasing availability of strong motion records makes the use of real accelerograms an attractive option for a proper definition of the input motions in the dynamic analysis of struc-tural and geotechnical systems. Despite different real accelerograms selection procedures have been proposed in the literature, there are situations in which it may be impossible to select a suitable code-required number of accelerograms without applying large scale factors which distort the actual characteristics of selected motions leading to unrealistic input. In these situ-ations, the use of artificial accelerograms could represent a possible alternative.A novel procedure for generating fully non-stationary spectrum compatible artificial accelero-grams, is presented in this paper.Depending on the aim to be achieved, it is possible to obtain the spectrum-compatibility be-tween the generated samples and the target action in terms of response spectrum or Fourier spectrum, using two different corrective Power Spectral density function terms.A numerical application shows the validity of the generation procedure and the accuracy of the model in reproducing realizations with statistical characteristics similar to those of the target motion.
A NOVEL METHOD FOR THE GENERATION OF FULLY NON-STATIONARY SPECTRUM COMPATIBLE ARTIFICIAL ACCELEROGRAMS
Federica Genovese
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2021-01-01
Abstract
The increasing availability of strong motion records makes the use of real accelerograms an attractive option for a proper definition of the input motions in the dynamic analysis of struc-tural and geotechnical systems. Despite different real accelerograms selection procedures have been proposed in the literature, there are situations in which it may be impossible to select a suitable code-required number of accelerograms without applying large scale factors which distort the actual characteristics of selected motions leading to unrealistic input. In these situ-ations, the use of artificial accelerograms could represent a possible alternative.A novel procedure for generating fully non-stationary spectrum compatible artificial accelero-grams, is presented in this paper.Depending on the aim to be achieved, it is possible to obtain the spectrum-compatibility be-tween the generated samples and the target action in terms of response spectrum or Fourier spectrum, using two different corrective Power Spectral density function terms.A numerical application shows the validity of the generation procedure and the accuracy of the model in reproducing realizations with statistical characteristics similar to those of the target motion.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
