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:: Volume 10, Issue 2 (Vol. 10, No. 2 Summer 2016 2016) ::
jeg 2016, 10(2): 3379-3404 Back to browse issues page
Comparison the Different Methods of Seismic Response Analysis in Liquefiable sites against Near and Far-Field Earthquakes
Mohammad Adampira 1, Hamid Alielahi2, Mehdi Panji3, Hamid Koohsari4
1- , m.adampira@srbiau.ac.ir
2- Islamic Azad university, Science and Research Branch, Tehran, Iran
3- Islamic Azad University, Zanjan Branch
4- Islamic Azad University Zanjan Branch
Abstract:   (4056 Views)

Due to the increasing importance of geomorphologic conditions on the seismic ground response, the effect of liquefiable soils on seismic ground surface response is discussed. At first, the equivalent linear analysis based on total stress model in the frequency domain is carried out and then the nonlinear analyses based on total stress, effective stress model and considering the pore water pressure development in time domain are done in order to evaluate the differences between the several types of ground response analysis methods. DEEPSOIL.Ver5 software is used based on the latest achievements and various techniques in both solution domains. LNG port project in Assaluyeh, situated in south of Iran, is considered as a case study. Due to lack of the real data recorded near-field fault at the project site, the simulated method is used in order to create the artificial earthquake. Also three far-field earthquakes have been selected based on conventional seismic hazard studies for the seismic ground response analysis. Then, in order to better understanding of the obtained responses, the resulted responses spectra are compared with the acceleration design spectra provided in some valid codes. The result of this study indicates that the pulse effect in the horizontal component of acceleration perpendicular to the fault plane direction, affects severely the surface ground response of the near-field earthquake. The obtained results of the nonlinear modeling of the soil with excess pore water pressure build-up in the time-domain are extremely different from those of frequency-domain responses based on the equivalent linear method. In addition, because of the inherent linearity of equivalent linear analysis which can lead to spurious resonances in ground responses, the peak ground acceleration in the time-domain is lower than the frequency-domain.

Keywords: Site seismic response, Equivalent linear method, Nonlinear method, Pore water pressure, Liquefaction
Full-Text [PDF 1598 kb]   (2264 Downloads)    
Type of Study: s | Subject: Geotecnic
Accepted: 2016/06/8 | Published: 2016/06/8
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Adampira M, Alielahi H, Panji M, Koohsari H. Comparison the Different Methods of Seismic Response Analysis in Liquefiable sites against Near and Far-Field Earthquakes. jeg. 2016; 10 (2) :3379-3404
URL: http://jeg.khu.ac.ir/article-1-2276-en.html


Volume 10, Issue 2 (Vol. 10, No. 2 Summer 2016 2016) Back to browse issues page
نشریه زمین شناسی مهندسی Journal of Engineering Geology
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