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《Journal of Earthquake Engineering and Engineering Vibration》 2008-03
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Prediction of non-stationary earthquake accelerograms compatible with design evolutionary spectra

ZHANG Cuiran,CHEN Houqun (Earthquake Engineering Research Centre,IWHR,Beijing 100044,China)  
On the basis of Priestley's evolutionary power spectra and the typical response spectrum compatible technique for design accelerograms,a new iteration method is developed for generation of random earthquake accelerograms non-stationary both in amplitude and frequency which are compatible with target evolutionary spectrum.Evolutionary power spectrum was obtained by Nakayama method and the initial phase angle was defined to distribute randomly between 0 and 2π.During the generation,the interaction between the evolutionary power spectrum and the phase angle has been considered.The evolutionary spectrum and the phase angle of the simulated accelerogram were modified until the convergence requirements were satisfied.Earthquake accelerograms simulated by this method have the same non-stationary characteristics as the design evolutionary spectrum and the phase spectra of these artificial earthquake accelerograms are non-stationary both in time and frequency domains.The correlation analysis shows that these simulated accelerograms have the same target evolutionary spectrum and the different initial phase angles are statistically independent.
【Fund】: 国家自然科学基金重点项目(90510017)
【CateGory Index】: P315.9
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