000020182 001__ 20182
000020182 005__ 20170118182358.0
000020182 04107 $$aeng
000020182 046__ $$k2017-01-09
000020182 100__ $$aFan, Zenglei
000020182 24500 $$aCross Evolutionary Power Spectra Estimation of Spatial Variable Seismic Ground Motions Using Generalized Harmonic Wavelets

000020182 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000020182 260__ $$b
000020182 506__ $$arestricted
000020182 520__ $$2eng$$aNonstationary characteristics of spatially variable seismic ground motions, which are mathematically described by cross evolutionary power spectra or evolutionary coherency, have significant effect on earthquake responses of nonlinear extended structures. Estimation and modeling of cross evolutionary power spectral density (EPSD) of spatially variable seismic ground motions are of interest in recent years for engineering purposes. This article presents an approach for estimating the cross EPSD of the spatially variable seismic ground motions by using the generalized harmonic wavelets (GHW). The cross EPSD and the evolutionary lagged coherency of the realistic spatially variable seismic ground motions are estimated by this approach. The time-varying nonstationary characteristics of these ground motions are also analyzed. First, after a brief review of the former studies in wavelets-based evolutionary spectra estimation, a cross EPSD estimation formula is derived using the GHW within the framework of evolutionary spectra estimation given by Spanos & Failla. Then, the proposed estimation formula is used to estimate the cross EPSDs of the seismic ground motions recorded at the SMART-1 array during Event 45. The cross EPSDs and the evolutionary lagged coherency between the center station and the outer ring stations, at separation distances of 2000m, are obtained. The comparisons of the estimated lagged coherency at different times indicate that the correlation of the spatially variable seismic ground motions is time-dependent. During the stable stage of the ground-motion intensity, the lagged coherency is close to 0.8 in the low frequency range and decays as frequency increasing. During the rising and decaying stages of the ground-motion intensity, the lagged coherency is fluctuant with a mean value of about 0.4.

000020182 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000020182 653__ $$across evolutionary power spectral density, evolutionary lagged coherency, seismic ground motion, generalized harmonic wavelets

000020182 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000020182 720__ $$aFan, Zenglei$$iWang, Ding
000020182 8560_ $$ffischerc@itam.cas.cz
000020182 8564_ $$s384741$$uhttps://invenio.itam.cas.cz/record/20182/files/701.pdf$$yOriginal version of the author's contribution as presented on USB, paper 701.
000020182 962__ $$r16048
000020182 980__ $$aPAPER