Numerical evaluation of slope topography effects on seismic ground motion

Bouckovalas, GD; Papadimitriou, AG

dc.contributor.author	Bouckovalas, GD	en
dc.contributor.author	Papadimitriou, AG	en
dc.date.accessioned	2014-03-01T01:22:50Z
dc.date.available	2014-03-01T01:22:50Z
dc.date.issued	2005	en
dc.identifier.issn	0267-7261	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16677
dc.subject	Earthquakes	en
dc.subject	Numerical analyses	en
dc.subject	Seismic motion	en
dc.subject	Slopes	en
dc.subject	Topography effects	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Earthquakes	en
dc.subject.other	Geology	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Soils	en
dc.subject.other	Surface topography	en
dc.subject.other	Seismic motion	en
dc.subject.other	Seismic response	en
dc.subject.other	Slopes	en
dc.subject.other	Seismology	en
dc.subject.other	amplification	en
dc.subject.other	ground motion	en
dc.subject.other	numerical model	en
dc.subject.other	topographic effect	en
dc.title	Numerical evaluation of slope topography effects on seismic ground motion	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.soildyn.2004.11.008	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.soildyn.2004.11.008	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	This paper presents results of numerical analyses for the seismic response of step-like ground slopes in uniform visco-elastic soil, under vertically propagating SV seismic waves. The aim of the analyses is to explore the effects of slope geometry, predominant excitation frequency and duration, as well as of the dynamic soil properties on seismic ground motion in a parametric manner, and provide qualitative as well as quantitative insight to the phenomenon. Among the main conclusions of this study is that this kind of topography may lead to intense amplification or de-amplification variability at neighboring (within a few tens of meters) points behind the crest of the slope, especially for high frequency excitations. Nevertheless, a general trend of amplification near the crest and de-amplification near the toe of the slope seems to hold for the horizontal motion. As a result of these two findings, it becomes evident that reliable field evidence of slope topography aggravation is extremely difficult to establish. Furthermore, this study highlights the generation of a parasitic vertical component of motion in the vicinity of the slope, due to wave reflections at the slope surface, that under certain preconditions may become as large as the horizontal. Criteria are established for deciding on the importance of topography effects, while approximate relations are provided for the preliminary evaluation of the topographic aggravation of seismic ground motion and the width of the affected zone behind the crest. (c) 2005 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Soil Dynamics and Earthquake Engineering	en
dc.identifier.doi	10.1016/j.soildyn.2004.11.008	en
dc.identifier.isi	ISI:000232068400008	en
dc.identifier.volume	25	en
dc.identifier.issue	7-10	en
dc.identifier.spage	547	en
dc.identifier.epage	558	en