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《Journal of Earthquake Engineering and Engineering Vibration》 2010-02
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Artificial ground motion based on target power spectra and envelope

XU Guodong 1 ,SHI Peijun2,ZHOU Xiyuan3 (1.Institute of Disaster Prevention Science and Technology,Sanhe 065201,China;2.Academy of Disaster Reduction and Emergency Management,Ministry of Civil Affairs&Ministry of Education,Beijing Normal University,Beijing 100875,China;3.Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100022,China)  
This article presents a method that takes the power spectrum and the enveloping curve as double target functions to synthesize the artificial ground motion.The method not only makes the spectrum of the artificial ground motion comply with the target spectrum,but also in the iterative process adjusts the ground motion wave-shape to conform to the goal enveloping curve function approximately,and eliminates the base-line shift in the acceleration time history,then makes the velocity and displacement time histories of ground motion more reasonable.The authors argue that the synthetic method based on the response spectrum may weaken the random characteristics of ground motion,and hence it may be imperfect to use the artificial ground motion based on response spectrum as an input to analyze the elastic-plastic structures.Using the artificial ground motion based the power spectrum model in elastic-plastic structure dynamic analysis may be one more reasonable alternative.The authors see that the sum of squares has the explicit physics significance,which is the total energy parameter of random signal.Through the the-oretical analysis and the numerical calculation,the authors think that the sum of squares(Means of squares multiplied by duration)is an important control factor in the amplitude of a stochastic statistical signal sample with certain duration.Consequently,the sum of squares,the normalized power spectrum,and the enveloping curve function in time domain are three essential factors of the ground motion based on the power spectrum model.
【Fund】: 国家科技支撑计划(2006BAD20B03);; 自然科学基金重大计划(90715038)
【CateGory Index】: P315.9
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