Interactions between topographic irregularities and seismic ground motion investigated using a hybrid FD-FE method

Ducellier, Ariane; Aochi, Hideo

doi:10.1007/s10518-011-9335-6

Cited by 22 publications

(6 citation statements)

References 25 publications

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“…Combining different methods such as FDM and FEM has also been proposed (e.g. Moczo & Kristek 2005;De Martin et al 2007;Ducellier & Aochi 2012).…”

Section: Introductionmentioning

confidence: 99%

Spectral element modelling of seismic wave propagation in visco-elastoplastic media including excess-pore pressure development

Oral¹,

Gelis²,

Bonilla³

2022

Preprint

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Numerical modelling of seismic wave propagation, considering soil nonlinearity, has become a major topic in seismic hazard studies when strong shaking is involved under particular soil conditions. Indeed, when strong ground motion propagates in saturated soils, pore pressure is another important parameter to take into account when successive phases of contractive and dilatant soil behaviour are expected. Here, we model 1-D seismic wave propagation in linear and nonlinear media using the spectral element numerical method. The study uses a three-component (3C) nonlinear rheology and includes pore-pressure excess. The 1-D– 3C model is used to study the 1987 Superstition Hills earthquake (ML 6.6), which was recorded at the Wildlife Refuge Liquefaction Array, USA. The data of this event present strong soil nonlinearity involving pore-pressure effects. The ground motion is numerically modelled for different assumptions on soil rheology and input motion (1C versus 3C), using the recorded borehole signals as input motion. The computed acceleration–time histories show low-frequency amplification and strong high-frequency damping due to the development of pore pressure in one of the soil layers. Furthermore, the soil is found to be more nonlinear and more dilatant under triaxial loading compared to the classical 1C analysis, and significant differences in surface displacements are observed between the 1C and 3C approaches. This study contributes to identify and understand the dominant phenomena occurring in superficial layers, depending on local soil properties and input motions, conditions relevant for site- specific studies.

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“…Combining different methods such as FDM and FEM has also been proposed (e.g. Moczo & Kristek 2005;De Martin et al 2007;Ducellier & Aochi 2012).…”

Section: Introductionmentioning

confidence: 99%

Spectral element modelling of seismic wave propagation in visco-elastoplastic media including excess-pore pressure development

Oral¹,

Gelis²,

Bonilla³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The theoretical analysis method mainly refers to the wave function expansion method [15,16]. Numerical methods include finite difference method [17], spectral element method [9], finite element method [18], boundary element method [19], and hybrid method [20]. Using the theoretical analysis method (wave function expansion method), Gao [21] reported that the peak acceleration recorded at SC1 was more than 2.5 times that at the SC4 of the Feitsui canyon (V-shape).…”

Section: Introductionmentioning

confidence: 99%

Seismic analysis of high-speed railway irregular bridge–track system considering V-shaped canyon effect

Zhu

Tang

et al. 2021

Rail. Eng. Science

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To explore the effect of canyon topography on the seismic response of railway irregular bridge–track system that crosses a V-shaped canyon, seismic ground motions of the horizontal site and V-shaped canyon site were simulated through theoretical analysis with 12 earthquake records selected from the Pacific Earthquake Engineering Research Center (PEER) Strong Ground Motion Database matching the site condition of the bridge. Nonlinear seismic response analyses of an existing 11-span irregular simply supported railway bridge–track system were performed under the simulated spatially varying ground motions. The effects of the V-shaped canyon topography on the peak ground acceleration at bridge foundations and seismic responses of the bridge–track system were analyzed. Comparisons between the results of horizontal and V-shaped canyon sites show that the top relative displacement between adjacent piers at the junction of the incident side and the back side of the V-shaped site is almost two times that of the horizontal site, which also determines the seismic response of the fastener. The maximum displacement of the fastener occurs in the V-shaped canyon site and is 1.4 times larger than that in the horizontal site. Neglecting the effect of V-shaped canyon leads to the inappropriate assessment of the maximum seismic response of the irregular high-speed railway bridge–track system. Moreover, engineers should focus on the girder end to the left or right of the two fasteners within the distance of track seismic damage.

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“…The feature of the earth's boundary that first comes to mind is the above-ground structure (AGS), often termed topography [56,21,19,14,4,16,20,24,25,27,32,34,42,43,47,48,57,64,65,73,75,79,111,118,119,135,171,181,183,195,216,265,279,282,283,305,322,325,344,371,383,227,228,229,327,285,270,215,85,106,225...…”

Section: Introductionmentioning

confidence: 99%

“…The AGS's affected by seismic waves can be divided into two classes: i) a 'natural' AGS such as a hill [14,25,46,55,71,73,118,131,159,181,191,193,194,197,205,241,251,256,264,268,255,278,307,376,378,85,87,153,46,212,269,106,375,326,376,325,333,264], volcano [296,282,307,219,60,219,296], mountain [177,178,351,352,353,…”

Section: Introductionmentioning

confidence: 99%

Resonant amplified seismic response within a hill or mountain

Wirgin

2020

Preprint

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We show theoretically what is meant by the term '(surface shape) resonance' in connection with the seismic response of a protuberance (emerging from flat ground) such as a hill or mountain of arbitrary shape. We address the specific problem of cylindrical protuberances of rectangular shape submitted to a SH plane wave. We find that the principal (i.e., qualitative) characteristics of the seismic response of a mountain are quite similar to those of a hill, and that the occurrence of significative amplification of the displacement field within these structures is due to the coupling of the incident wave to (surface shape) resonances.

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Interactions between topographic irregularities and seismic ground motion investigated using a hybrid FD-FE method

Cited by 22 publications

References 25 publications

Spectral element modelling of seismic wave propagation in visco-elastoplastic media including excess-pore pressure development

Spectral element modelling of seismic wave propagation in visco-elastoplastic media including excess-pore pressure development

Seismic analysis of high-speed railway irregular bridge–track system considering V-shaped canyon effect

Resonant amplified seismic response within a hill or mountain

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