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Seismic site effects by an optimized 2D BE/FE method II. Quantification of site effects in two-dimensional sedimentary valleys

Abstract : This paper deals with the evaluation of seismic site effects due to the local topographical and geotechnical characteristics. The amplification of surface motions is calculated by a numerical method combining finite elements in the near field and boundary elements in the far field (FEM/BEM). The numerical technique is improved by time truncation. In the first part of this article, the accuracy and the relevance of this optimized method are presented. Moreover, parametric studies are done on slopes, ridges and canyons to characterize topographical site effects. The second part deals with sedimentary valleys. The complexity of the combination of geometrical and sedimentary effects is underlined. Extensive parametrical studies are done to discriminate the topographical and geotechnical effects on seismic ground movement amplifications in two-dimensional irregular configurations. Characteristic coefficients are defined to predict the amplifications of horizontal displacements. The accuracy of this quantitative evaluation technique is tested and discussed.
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https://hal.archives-ouvertes.fr/hal-00518489
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Submitted on : Friday, September 17, 2010 - 2:09:45 PM
Last modification on : Tuesday, December 8, 2020 - 10:20:28 AM

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Behrouz Gatmiri, Chloé Arson. Seismic site effects by an optimized 2D BE/FE method II. Quantification of site effects in two-dimensional sedimentary valleys. Soil Dynamics and Earthquake Engineering, Elsevier, 2008, 28 (8), pp.646-661. ⟨10.1016/j.soildyn.2007.09.002⟩. ⟨hal-00518489⟩

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