Evaluation of seismic ground motion induced by topographic irregularity

Nguyen, Khoa-Van; Gatmiri, Behrouz

doi:10.1016/j.soildyn.2006.06.005

Cited by 79 publications

(33 citation statements)

References 1 publication

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“…It is shown that the deeper canyon has the more amplification effect at the edges and the more attenuation effect is seen inside the canyon. These results agree well with the literature (Nguyen & Gatmiri 2007;Gatmiri & Arson 2008). When H/L ratio gets increases: (i) the horizontal displacements inside the canyon decrease and reach local minimum, (ii) close to the edges, horizontal displacements increase, but the distance from the centre of the canyon, the horizontal displacements decrease and are almost become equal to those of the reference system (T 0) without structure.…”

Section: Resultssupporting

confidence: 92%

“…However, amplification is also affected by geological properties (Chuhan & Chongbin 1988;Gatmiri & Arson 2008). It is also reported by Nguyen & Gatmiri (2007) and Gatmiri & Arson (2008) that surface shape and depth are very effective on whole system motion. The results are obtained in this study correspond with those of the literature.…”

Section: Resultsmentioning

confidence: 85%

“…Another case-study is carried out by Stewart & Sholtis (2005) to determine the effects of topography and geological amplification on single-faced slopes. Nguyen & Gatmiri (2007) carried out a parametric study on the 2-D scattering of seismic waves by arbitrary topography by using boundary and finite elements. Gatmiri & Arson (2008) carried out a parametric study to quantify the site effects in 2-D sedimentary valleys by using an optimized 2-D boundary and finite element method.…”

Section: Introductionmentioning

confidence: 99%

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A study on soil-structure interaction analysis in canyon-shaped topographies

Düzgün

Budak

2010

Sadhana

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In this paper, a coupled finite and infinite element system is used to study the effects of canyon-shaped topography and geotechnical characteristics of the soil on the dynamic response of free surface and of 2-D soil-structure systems under ground motion. A parametric study is carried out for canyon-shaped topographies. It is concluded that topographic conditions may have important effects on the ground motion along the canyon. Geotechnical properties of the soil also have significant amplification effects on the whole system motion, which cannot be neglected for design purposes. Thus, the dynamic response of both free surface and a soil-structure system are primarily affected by surface shapes and geotechnical properties of the soil. Location of the structure is another parameter affecting the whole system response.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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A study on soil-structure interaction analysis in canyon-shaped topographies

Düzgün

Budak

2010

Sadhana

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“…In particular, the effect of steplike slope topography (i.e. a sketched slope profile constituted of flat top and bottom and of a constant dip face) on seismic ground motions has been studied by using numerical modeling Bouckovalas and Papadimitriou, 2005;Nguyen and Gatmiri, 2007;Papadimitriou and Chaloulos, 2010;Lenti and Martino, 2011), as reliable field measurements are difficult to obtain because wave scattering due to step-like slope geometries require an unrealistically dense distribution of recording stations. These studies have demonstrated that (i) step-like slope topographies may lead to intense amplification and de-amplification irregularly along the slope, depending on the slope geometry; and (ii) the possible interactions among the seismic input, the slope and preexisting landslide masses depend on seismic properties such as frequency content, directivity and the peak of ground acceleration (Bozzano et al, 2008(Bozzano et al, , 2011aMartino and Scarascia Mugnozza, 2005;Del Gaudio and Wasowsky, 2010;Lenti and Martino, 2011).…”

Section: P Alfaro Et Al: the Role Of Near-field Interaction Betweenmentioning

confidence: 99%

The role of near-field interaction between seismic waves and slope on the triggering of a rockslide at Lorca (SE Spain)

Alfaro

Delgado²,

García-Tortosa³

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. A ∼1000 m 3 rockslide occurred close to Lorca (SE Spain) during the main shock (M w = 5.1) of the May 2011 seismic sequence. The location of the rockslide, within 10 km of the earthquake epicenter and along the southern slope of a valley in which similar geological conditions occur on both slopes of the valley, suggests a significant near-field effect due to local seismic response. This could be related to the specific interaction between the topography and the obliquely propagating seismic waves.A dynamic stress strain numerical model was constructed using the FLAC 7.0 finite difference code to back analyze the Lorca rockslide event and relate its occurrence to both the local seismic amplification and the interaction between seismic waves and local topography. The results indicate that only for seismic waves with incidence angles in the range 0 • -50 • are the occurred slope instabilities expected. These results do not significantly change when varying the values for either stiffness or strength parameters within the range of the experimental data.

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“…Generally, numerical studies of the e ect of topographic irregularities on the ground response are multidimensional analyses, which use various approaches such as Finite Element Method (FEM) (e.g., [9,10]); Boundary Element Method (BEM) (e.g., [11,12]); Spectral Element Method (SEM) (e.g., [13]); Finite Di erence Method (FDM) (e.g., [14]); and hybrid methods such as coupled Finite and In nite Element method (FE-IFE) (e.g., [15,16]), and coupled Finite and Boundary Element Method (FEM-BEM) (e.g., [17,18]). Detailed explanation of multidimensional analyses and comparison of results may be found in some references (e.g., [9,19,20]).…”

Section: Introductionmentioning

confidence: 99%

Non-linear Seismic Ground Response Analysis Considering Two-dimensional Topographic Irregularities

Soltani

Bagheripour

2017

Scientia Iranica

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Abstract. In the occurrence of an earthquake, local site conditions such as soil characteristics, dimension of topographic irregularities, seismic bedrock depth, etc. as well as characteristics of incident wave have important e ects on seismic ground response. In this study, Finite Element Method (FEM) coupled with viscous boundaries is used to evaluate the e ect of empty two-dimensional valleys on ampli cation or attenuation of seismic waves. Parametric studies are carried out and the e ects of dimension of the topography, frequency of the incident wave, and bedrock depth on the seismic ground response are considered using non-linear method in a time domain analysis. Results are shown by means of horizontal and vertical ampli cation ratios in valley span and its surrounding area. It is concluded that displacement variation on ground surface due to topographical e ects is a considerable factor to select a site location or design structures in the valley mount and its surrounding area.

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Evaluation of seismic ground motion induced by topographic irregularity

Cited by 79 publications

References 1 publication

A study on soil-structure interaction analysis in canyon-shaped topographies

A study on soil-structure interaction analysis in canyon-shaped topographies

The role of near-field interaction between seismic waves and slope on the triggering of a rockslide at Lorca (SE Spain)

Non-linear Seismic Ground Response Analysis Considering Two-dimensional Topographic Irregularities

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