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Time-dependent power spectral density of earthquake ground motion
This paper investigates the stationarity of earthquake accelerograms and shows that the strong motion segments constitute a locally stationary random process. For such a process, a time-dependent power spectral density may be formulated as the product of: (a) a mean-square acceleration; (b) a time scale factor describing the variation of the local mean square acceleration; and (c) a normalized power spectral density describing the frequency structure of the motion.A segmental time averaging procedure is proposed for obtaining a time scale factor, an envelope function, and a normalized power spectral density from the strong motion segment of accelerograms. The procedure is used to compute smooth normalized power spectral densities from a total of 367 horizontal and vertical components of accelerograms recorded on alluvium, rock, and alluvium underlain by rock.
Time-dependent power spectral density of earthquake ground motion
This paper investigates the stationarity of earthquake accelerograms and shows that the strong motion segments constitute a locally stationary random process. For such a process, a time-dependent power spectral density may be formulated as the product of: (a) a mean-square acceleration; (b) a time scale factor describing the variation of the local mean square acceleration; and (c) a normalized power spectral density describing the frequency structure of the motion.A segmental time averaging procedure is proposed for obtaining a time scale factor, an envelope function, and a normalized power spectral density from the strong motion segment of accelerograms. The procedure is used to compute smooth normalized power spectral densities from a total of 367 horizontal and vertical components of accelerograms recorded on alluvium, rock, and alluvium underlain by rock.
Time-dependent power spectral density of earthquake ground motion
Elghadamsi, F.E. (author) / Mohraz, B. (author) / Lee, C.T. (author) / Moayyad, P. (author)
Soil Dynamics and Earthquake Engineering ; 7 ; 15-21
1987-02-15
7 pages
Article (Journal)
Electronic Resource
English
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