Seismic response analysis of loess site under far-field bedrock ground motion of the Wenchuan earthquake.

In this paper, considering the far-field seismic input, an accelerogram recorded in the bedrock at Wuquan Mountain in Lanzhou city during the 2008 Wenchuan Ms8.0 earthquake was selected, and numerical dynamic analyses were conducted. The one-dimensional equivalent linear method was implemented to es...

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Autor principal:	Tuo Chen
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d37cc992f39d4b11ac9d46894e6afd1d
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spelling	oai:doaj.org-article:d37cc992f39d4b11ac9d46894e6afd1d2021-12-02T20:08:52ZSeismic response analysis of loess site under far-field bedrock ground motion of the Wenchuan earthquake.1932-620310.1371/journal.pone.0254871https://doaj.org/article/d37cc992f39d4b11ac9d46894e6afd1d2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0254871https://doaj.org/toc/1932-6203In this paper, considering the far-field seismic input, an accelerogram recorded in the bedrock at Wuquan Mountain in Lanzhou city during the 2008 Wenchuan Ms8.0 earthquake was selected, and numerical dynamic analyses were conducted. The one-dimensional equivalent linear method was implemented to estimate the ground motion effects in the loess regions. Thereafter, slope topographic effects on ground motion were studied by applying the dynamic finite-element method. The results revealed the relationship between the PGA amplification coefficients and the soil layer thickness, which confirmed that the dynamic response of the sites had obvious nonlinear characteristics. The results also showed that there was an obvious difference in the dynamic magnification factor between the short-period and long-period structures. Moreover, it was found that the amplification coefficient of the observation point at the free surface was greater than the point inside the soil at the same depth, which mainly occurred in the upper slope. Through this study, the quantitative assessment of ground motion effects in loess regions can be approximately estimated, and the amplification mechanism of the far-field ground motion mechanism can be further explained. In addition to the refraction and reflection theory of seismic waves, the resonance phenomenon may help explain the slope topographic effect through spectrum analysis.Tuo ChenPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 7, p e0254871 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tuo Chen Seismic response analysis of loess site under far-field bedrock ground motion of the Wenchuan earthquake.
description	In this paper, considering the far-field seismic input, an accelerogram recorded in the bedrock at Wuquan Mountain in Lanzhou city during the 2008 Wenchuan Ms8.0 earthquake was selected, and numerical dynamic analyses were conducted. The one-dimensional equivalent linear method was implemented to estimate the ground motion effects in the loess regions. Thereafter, slope topographic effects on ground motion were studied by applying the dynamic finite-element method. The results revealed the relationship between the PGA amplification coefficients and the soil layer thickness, which confirmed that the dynamic response of the sites had obvious nonlinear characteristics. The results also showed that there was an obvious difference in the dynamic magnification factor between the short-period and long-period structures. Moreover, it was found that the amplification coefficient of the observation point at the free surface was greater than the point inside the soil at the same depth, which mainly occurred in the upper slope. Through this study, the quantitative assessment of ground motion effects in loess regions can be approximately estimated, and the amplification mechanism of the far-field ground motion mechanism can be further explained. In addition to the refraction and reflection theory of seismic waves, the resonance phenomenon may help explain the slope topographic effect through spectrum analysis.
format	article
author	Tuo Chen
author_facet	Tuo Chen
author_sort	Tuo Chen
title	Seismic response analysis of loess site under far-field bedrock ground motion of the Wenchuan earthquake.
title_short	Seismic response analysis of loess site under far-field bedrock ground motion of the Wenchuan earthquake.
title_full	Seismic response analysis of loess site under far-field bedrock ground motion of the Wenchuan earthquake.
title_fullStr	Seismic response analysis of loess site under far-field bedrock ground motion of the Wenchuan earthquake.
title_full_unstemmed	Seismic response analysis of loess site under far-field bedrock ground motion of the Wenchuan earthquake.
title_sort	seismic response analysis of loess site under far-field bedrock ground motion of the wenchuan earthquake.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/d37cc992f39d4b11ac9d46894e6afd1d
work_keys_str_mv	AT tuochen seismicresponseanalysisofloesssiteunderfarfieldbedrockgroundmotionofthewenchuanearthquake
_version_	1718375151654928384

Seismic response analysis of loess site under far-field bedrock ground motion of the Wenchuan earthquake.

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