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Seismic site effects by an optimized 2D BE/FE method II. Quantification of site effects in two-dimensional sedimentary valleys |
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| Authors: | B Gatmiri C Arson |
| Institution: | aUniversity of Tehran, Tehran, Iran bCERMES, Ecole Nationale des Ponts et Chaussées, Cité Descartes, Champs-sur-Marne, 6-8 avenue Blaise Pascal, 77455 Marne-la-Vallée cedex 2, France |
| 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. |
| Keywords: | Hybrid numerical technique Elastodynamics Site effect Seismic amplification Topography Geotechnical configuration Sedimentary valley Characteristic coefficients 2D models Predictive calculation method |
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