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Issues in stochastic modeling of ground motions based on analytical phase spectrum
ZENG Cheng,SUN Xiaodan * #,LI Yongheng
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031
*Correspondence author
#Submitted by
Subject:
Funding: Ph.D. Programs Foundation of Ministry of Education of China (No.20120184120032)
Opened online: 1 June 2016
Accepted by: none
Citation: ZENG Cheng,SUN Xiaodan,LI Yongheng.Issues in stochastic modeling of ground motions based on analytical phase spectrum[OL]. [ 1 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4693864
 
 
In this paper, stochastic modeling technique based on analytical phase spectrum was studied. The analytical displacement response to a shear dislocation source in infinite homogeneous space was used to extract analytical phase spectrum. The analytical phase spectrum was used to replace the random phase spectrum so that the spectrum of the simulated motion is related to the property of propagation medium and the source-site geometry. Two issues, the simplification of numerical integration and the computation of sub-source rise time, were discussed. The results show that: when the sub-source size is smaller than 1km, the numerical integration could be simplified by multiplying the sub-source area to the displacement from point dislocation source; unreasonable sub-source rise time may be deduced if letting sub-source rise time propotional to sub-source dislocation.The approach was validated using the observed data of the 1994 Northridge earthquake. The validation shows a good match between the simulated and observed data in terms of waveform and response spectrum.
Keywords:Disaster Prevention and Reduction Engineering and Protective Engineering; Stochastic Simulation; Analytical phase spectrum; Rise time
 
 
 

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